Последняя версия firefox для windows 2000

Firefox 12

Firefox 11

Firefox 10

Firefox 9

Firefox 8

Firefox 7

• Better standards support for HTML5, CSS3, MathML, XHR, and SMIL
• Better visibility for the Do not track header preference^[24]
• Stability and security improvements^[25][26][27]
• Better tuned HTTP idle connection logic^[24]
• Improved canvas, JavaScript, memory, and networking performance
• Improved spell checking for some locales
• Improved desktop environment integration for Linux users
• Better WebGL security (WebGL content can no longer load cross-domain textures).^[28]
• Background tabs have setTimeout and setInterval clamped to 1000 ms to improve performance^[29]
• Gecko version number bumped to 5.0 to match (and from then on stay synced to) Firefox’s major version number.^[30]
• Added support for CSS animations.
• The Do-Not-Track header preference has been moved to increase discoverability.
• Tuned HTTP idle connection logic for increased performance.
• Improved canvas, JavaScript, memory, and networking performance.
• Improved standards support for HTML5, XHR, MathML, SMIL, and canvas.
• Improved spell checking for some locales.
• Improved desktop environment integration for Linux users.
• WebGL content can no longer load cross-domain textures.
• Background tabs have setTimeout and setInterval clamped to 1000 ms to improve performance.

• Fixed an issue in Mac OS X 10.7 that could cause Firefox to crash^[31]
• Fixed an issue caused by Apple’s «Java for Mac OS X 10.6 Update 5» where the Java plugin would not be loaded^[32]

End-of-life 5.0.x product line on August 16, 2011.

• about:permissions, a permissions manager. The user can choose what information can be shared with sites, e.g. location.
• The address bar now highlights the domain of the website you’re visiting.
• Streamlined the look of the site identity block.
• Added support for the latest draft version of WebSockets with a prefixed API.
• Added support for EventSource / server-sent events.
• Added support for window.matchMedia.
• Added Scratchpad, an interactive JavaScript prototyping environment.
• Added a new Web Developer menu item and moved development-related items into it.
• Improved usability of the Web Console.
• Improved the discoverability of Firefox Sync.
• Reduced browser startup time when using Panorama.
• Fixed several stability and security issues.

• Revoked the root certificate for DigiNotar due to fraudulent SSL certificate issuance.^[33]

• Removed trust exceptions for certificates issued by Staat der Nederlanden
• Resolved an issue with gov.uk websites.
• Last release for Android 2.0

End-of-life 6.0.x product line on September 27, 2011.

• Drastically improved memory handling for certain use cases.
• Added a new rendering backend to speed up Canvas operations on Windows systems.
• Bookmark and password changes now sync almost instantly when using Firefox Sync.
• The http:// URL prefix is now hidden by default.
• Added support for text-overflow: ellipsis.
• Added support for the Web Timing specification.
• Enhanced support for MathML.
• The WebSocket protocol has been updated from version 7 to version 8.
• Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox.
• Fixed several security and stability issues.

• Fixed a rare issue where some users could find one or more of their add-ons hidden after a Firefox update.
• Last release for Maemo.

End-of-life 7.0.x product line on November 8, 2011.

• Add-ons installed by third-party programs are now disabled by default.
• Added a one-time add-on selection dialog to manage previously installed add-ons.
• Added Twitter to the search bar.
• Added a preference to load tabs on demand, improving startup time when windows are restored.
• Improved performance and memory handling when using <audio> and <video> elements.
• Added Cross-Origin Resource Sharing (CORS) support for cross-domain textures in WebGL.
• Added support for HTML5 context menus.
• Added support for insertAdjacentHTML().
• Improved CSS hyphen support for many languages.
• Improved WebSocket support.

Changes during betas

• Removed support for new tab animation due to incompatibilities with some extensions.

• Fixed Mac OS X crash that occurred in certain instances when a Java Applet is loaded with Java SE 6 version 1.6.0_29 installed.
• Fixed Windows startup crash caused by RoboForm versions older than 7.6.2.

End-of-life 8.0.x product line on December 20, 2011.

• Added type inference, significantly improving JavaScript performance.
• Improved theme integration for Mac OS X Lion.
• Added two finger swipe navigation for Mac OS X Lion.
• Added support for querying Do Not Track status via JavaScript.
• Added support for the font-stretch CSS property.
• Improved support for the text-overflow CSS property.
• Improved standards support for HTML5, MathML, and CSS.

• Fixed crash on Windows, Mac and Linux.

End-of-life 9.0.x product line on January 31, 2012.

• Most add-ons are now compatible with new versions of Firefox by default.
• Anti-Aliasing for WebGL is now implemented.
• CSS3 3D-Transforms are now supported.
• New <bdi>...</bdi> element for bi-directional text isolation, along with supporting CSS properties.
• Full Screen APIs allow you to build a web application that runs full screen.

First Extended Support Release (ESR).^[38]

Same changelogs of 10.0

Same changelogs of 10.0.1

• Fixed Java applets that sometimes caused text input to become unresponsive.

End-of-life 10.0.x product line on March 13, 2012.

Same changelogs of 10.0.2

• Security fixes^[77]
• Fixed web workers running out of memory, affecting some add-ons used by organizations.

• Fixed an issue in Firefox ESR 10.0.3 that caused the «Whats New» page to open after an update.
• Fixed extensions.checkCompatibility.* prefs not working in ESR releases.

• Fixed the 10.0.5 Firefox top crash with signature [@ GLEngine@0x620cf ].

• Fixed some text editing inconsistencies.

• Fixed contenteditable breaks in 10.0.7 that middle-click to open links.
• Addressed a fix that allows specifying wildcard that matches all simple netbiosnames in network.automatic-ntlm-auth.trusted-uris.

• Migration of settings from Google Chrome.
• SPDY protocol support (disabled by default).
• RFC 6455 WebSocket protocol support with an unprefixed API.
• Page Inspector Tilt (3D View).
• Sync Add-ons.
• Redesigned HTML5 video controls.
• Style Editor (CSS).

End-of-life 11.0.x product line on April 24, 2012.

• Windows: Firefox is now easier to update with one less prompt (User Account Control).
• Last release for Windows 2000.^[87]
• Reintroduced on-demand loading of pinned tabs after restoring a session.
• Page Source now has line numbers.
• Line breaks are now supported in the title attribute.
• Improvements to «Find in Page» to center search result.
• URLs pasted into the download manager window are now automatically downloaded.
• Support for the text-align-last CSS property has been added.
• Experimental support for ECMAScript 6 Map and Set objects has been implemented.
• Some TinyMCE-based editors failed to load.
• OS X: WebGL performance may be degraded on some hardware.

End-of-life 12.0.x product line on June 5, 2012.

• When opening a new tab, users are now presented with their most visited pages.
• The default home page now has quicker access to bookmarks, history, settings, and more.
• SPDY protocol now enabled by default for faster browsing on supported sites.
• Restored background tabs are not loaded by default for faster startup.
• Smooth scrolling is now enabled by default.
• 72 total improvements to Page Inspector, HTML panel, Style Inspector, Scratchpad and Style Editor.
• The column-fill CSS property has been implemented.
• Experimental support for ECMAScript 6 Map and Set objects has been implemented.
• Support for the CSS3 background-position property extended syntax has been added.
• The :invalid pseudo-class can now be applied to the element.
• The CSS turn angle unit is now supported.

• Fixed an issue when Windows Messenger did not load in Hotmail, and the Hotmail inbox did not auto-update.
• Fixed the Hebrew text that was sometimes rendered incorrectly.
• Fixed an issue in Adobe Flash 11.3 that sometimes caused a crash on quit.

End-of-life 13.0.x product line on July 17, 2012.

Official Firefox Mobile 14.0 release.^[60]

• Google searches now utilize HTTPS.
• Full screen support for Mac OS X Lion implemented.
• Plugins can now be configured to only load on click (about:config).
• The Awesome Bar now auto-completes typed URLs, a new feature that will suggest a website that user frequently visits for a faster browsing.^[89]
• Improved site identity manager, to prevent spoofing of an SSL connection with favicons.
• Pointer Lock API implemented.
• New API to prevent your display from sleeping.
• New text-transform and font-variant CSS improvements for Turkic languages and Greek.
• Long URLs now extend the status bar almost to the whole width of the viewport.
• Optional Gstreamer backend for HTML5 video to allow H.264 playback.^[90] This allows playback of H.264 if the codec is installed as a GStreamer plugin. GStreamer support is not enabled in the official builds, but can be enabled at compile time.

Official Firefox Desktop 14.0 release.^[91]

• Fixed the GIF animation that can get stuck when src and image size are changed.
• Mac OS X: Fixed the nsCocoaWindow::ConstrainPosition that uses wrong screen in multi-display setup.
• Fixed the CSS :hover regression when an element’s class name is set by JavaScript.

End-of-life 14.0.x product line on August 28, 2012.

• Silent update: Background updates.
• Support for SPDY networking protocol v3.
• WebGL enhancements, including compressed textures for better performance.
• Localization in Maithili.
• Optimized memory usage for add-ons.
• JavaScript debugger integrated into developer tools.
• New layout view added to Inspector.
• High precision event timer implemented.
• The CSS word-break property has been implemented.
• New responsive design tool allows web developers to switch between desktop and mobile views of sites.
• Native support for the Opus audio format added.
• The <audio> and <video> elements now support the played attribute.
• The source element now supports the media attribute.
• Fixed the focus rings that keep growing when repeatedly tabbing through elements.

• Addressed a fix where sites visited while in Private Browsing mode could be found through manual browser cache inspection.

End-of-life 15.0.x product line on October 9, 2012.

• Firefox on Mac OS X now has preliminary VoiceOver support turned on by default.
• Initial web app support (Windows/Mac/Linux).
• Acholi and Kazakh localizations added.
• Improvements around JavaScript responsiveness through incremental garbage collection.
• New Developer Toolbar with buttons for quick access to tools, error count for the Web Console, and a new command line for quick keyboard access.
• CSS3 Animations, Transitions, Transforms and Gradients unprefixed.
• Recently opened files list in Scratchpad implemented.
• Fixed an issue where debugger breakpoints do not catch on page reload.
• No longer supporting MD5 as a hash algorithm in digital signatures.
• Opus support by default.
• Reverse animation direction has been implemented.
• Per tab reporting in about:memory.
• User Agent strings for pre-release Firefox versions now show only major version.

Final release to support Mac OS X Leopard^[94]
End-of-life 16.0.x product line on November 20, 2012.

• First revision of the Social API and support for Facebook Messenger.
• Click-to-play blocklisting implemented to prevent vulnerable plugin versions from running without the user’s permission.
• Updated Awesome Bar experience with larger icons.
• Mac OS X 10.5 is no longer supported.
• JavaScript Maps and Sets are now iterable.
• SVG FillPaint and StrokePaint implemented.
• Improvements that make the Web Console, Debugger and Developer Toolbar faster and easier to use.
• New Markup panel in the Page Inspector allows easy editing of the DOM.
• Sandbox attribute for iframes implemented, enabling increased security.
• Over twenty performance improvements, including fixes around the New Tab page.
• Fixed pointer lock that doesn’t work in web apps.
• Fixed page scrolling on sites with fixed headers.

• Reverted user agent change causing some website incompatibilities.
• Fixed font rendering issue.

End-of-life 17.0.x product line on January 8, 2013.

• Fixed improvements to the Click-to-Play vulnerable plugin blocklisting feature.^[113]

• Updated ESR17 to NSS 3.14.5 RTM.

End-of-life 17.0.x ESR product line on December 10, 2013.

• Faster JavaScript performance via IonMonkey compiler.
• Support for Retina displays on OS X 10.7 and up.
• Preliminary support for WebRTC.
• Better image quality with Mozilla’s new HTML scaling algorithm.
• Performance improvements around tab switching.
• Support for new DOM property window.devicePixelRatio.
• Improvement in startup time through smart handling of signed extension certificates.
• Support for W3C touch events implemented, taking the place of MozTouch events.
• Disable insecure content loading on HTTPS pages.
• Improved responsiveness for users on proxies.

Changes during Aurora releases

• Adds a Metro user interface on Windows 8.

• Fixed problems involving HTTP Proxy Transactions.
• Fixed unity player crashes on Mac OS X.
• Disabled HIDPI support on external monitors to avoid rendering glitches.

• Built-in PDF Viewer.
• Canvas elements can export their content as an image blob using canvas.toBlob().
• Startup performance improvements.
• Debugger now supports pausing on exceptions and hiding non-enumerable properties.
• Remote Web Console is available for connecting to Firefox on Android or Firefox OS (experimental, set devtools.debugger.remote-enabled to true).
• There is now a Browser Debugger available for add-on and browser developers (experimental, set devtools.chrome.enabled to true).
• Web Console CSS links now open in the Style Editor.
• CSS @page is now supported.
• CSS viewport-percentage length units implemented (vh, vw, vmin and vmax).
• CSS text-transform now supports full-width.
• Fixed certain valid WebGL drawing operations that were incorrectly rejected, leaving incomplete rendering in affected pages.
• Fixed an issue that starting Firefox with -private flag incorrectly claims you are not in Private Browsing mode.
• Fixed plugins that stop rendering when the top half of the plugin is scrolled off the top of the page, in HiDPI mode.

• Windows 8 only: Fixed stability issue for some AMD Radeon HD graphics cards.

• Released to address a security vulnerability in the HTML editor.
• Last release for Android 2.1

End-of-life 19.0.x product line on April 2, 2013.

• Per-window Private Browsing.
• New download experience.
• Ability to close hanging plugins, without the browser hanging.
• Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.).
• Continued implementation of draft ECMAScript 6 – clear() and Math.imul.
• New JavaScript Profiler tool.
• getUserMedia implemented for web access to the user’s camera and microphone (with user permission).
• <canvas> now supports blend modes.
• Various <audio> and <video> improvements.
• Fixed: Details button on Crash Reporter.
• Fixed: Unity plugin that doesn’t display in HiDPI mode.

• Windows-only update to handle issues around handling UNC paths.

End-of-life 20.0.x product line on May 14, 2013.

• The Social API now supports multiple providers.
• Enhanced three-state UI for Do Not Track (DNT).
• Preliminary implementation of Firefox Health Report.
• Firefox will suggest how to improve your application startup time if needed.
• Ability to Restore removed thumbnails on New tab Page.
• CSS -moz-user-select:none selection changed to improve compatibility with -webkit-user-select:none.
• Graphics related performance improvements.
• Removed E4X support from SpiderMonkey.
• Implemented Remote Profiling.
• Integrated, Add-on SDK loader and API libraries into Firefox.
• Added support for <main> element.
• Implemented scoped stylesheets.
• Fixed: Some function keys may not work when pressed.
• Fixed: Browsing and Download history clearing needs unification to avoid confusion on clearing download history.

End-of-life 21.0.x product line on June 25, 2013.

• WebRTC is now enabled by default.
• Windows: Firefox now follows display scaling options to render text larger on high-res displays.
• Mac OS X: Download progress in Dock application icon.
• HTML5 audio/video playback rate can now be changed.
• Social services management implemented in Add-ons Manager.
• asm.js optimizations (OdinMonkey) enabled for major performance improvements.
• Improved WebGL rendering performance through asynchronous canvas updates.
• Plain text files displayed within Firefox will now word-wrap.
• For user security, the |Components| object is no longer accessible from web content.
• Improved memory usage and display time when rendering images.
• Pointer Lock API can now be used outside of fullscreen.
• CSS3 Flexbox implemented and enabled by default.
• New Web Notifications API implemented.
• Added clipboardData API for JavaScript access to a user’s clipboard.
• New built-in font inspector.
• New HTML5 <data> and <time> elements
• Fixed: Scrolling using some high-resolution-scroll aware touchpads feels slow.

End-of-life 22.0.x product line on August 6, 2013.

In this Version Mozilla changed the Firefox Logo.

• Mixed content blocking enabled to protects users from man-in-the-middle attacks and eavesdroppers on HTTPS pages.
• Options panel created for Web Developer Toolbox.
• «Enable JavaScript» preference checkbox has been removed and user-set values will be reset to the default.
• Improved about:memory’s functional UI.
• Simplified interface for notifications of plugin installation.
• Enabled DXVA2 on Windows Vista+ to accelerate H.264 video decoding.
• Users can now switch to a new search provider across the entire browser.
• CSP policies using the standard syntax and semantics will now be enforced.
• <input type='file'> rendering improvements.
• Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000 Hz rate.
• «Load images automatically» and «Always show the tab bar» checkboxes removed from preferences and reset to defaults.
• HTML5 <input type="range"> form control implemented.
• Write more accessible pages on touch interfaces with new ARIA role for key buttons.
• Social share functionality.
• Added unprefixed requestAnimationFrame.
• Implemented a global browser console.
• Dropped blink effect from text-decoration: blink; and completely removed <blink> element.
• New feature in toolbox: Network Monitor.

• Fixed rendering glitches on H.264 video only in Firefox 23 on Windows Vista.
• Fixed spell checking that was broken with non-ASCII characters in profile path.
• Fixed audio static/»burble»/breakup in Firefox to Firefox WebRTC calls.

End-of-life 23.0.x product line on September 17, 2013.

• Support for new scrollbar style in Mac OS X 10.7 and newer.
• Implemented Close tabs to the right.
• Social: Ability to tear-off chat windows to view separately by simply dragging them out.
• Accessibility related improvements on using pinned tabs.
• Removed support for Revocation Lists feature.
• Performance improvements on New Tab Page loads.
• Major SVG rendering improvements around Image tiling and scaling.
• Improved and unified Browser console for enhanced debugging experience, replacing existing Error console.
• Removed support for sherlock files that are loaded from application or profile directory.
• Replaced fixed-ratio audio resampler in webrtc.org capture code with Speex resampler and eliminated pseudo-44,000  rate.

End-of-life 24.0.x product line on October 29, 2013.

• Updated branches that use 4.10 RTM to 4.10.2 RTM.
• Updated Mozilla to NSS 3.15.3 (new alternative NSS branch) to pick up a few fixes.
• Fixed an issue where some UI strings in Firefox 24.1.0 ESR l10n builds are in English.

• Web Audio support.
• The find bar is no longer shared between tabs.
• If away from Firefox for months, you now will be offered the option to migrate another browser’s history and settings.
• Resetting Firefox no longer clears your browsing session.
• CSS3 background-attachment:local support to control background scrolling.
• Many new ES6 functions implemented.
• iframe document content can now be specified inline.
• Fixed blank or missing page thumbnails when opening a new tab.

• Fixed pages that sometimes wouldn’t load without first moving the cursor.

End-of-life 25.0.x product line on December 10, 2013.

• All Java plug-ins are defaulted to ‘click to play’.
• Password manager now supports script-generated password fields.
• Updates can now be performed by Windows users without write permissions to Firefox install directory (requires Mozilla Maintenance Service).
• Support for H.264 on Linux if the appropriate gstreamer plug-ins are installed.
• Support for MP3 decoding on Windows XP, completing MP3 support across Windows OS versions.
• CSP implementation now supports multiple policies, including the case of both an enforced and Report-Only policy, per the specification.
• Social API now supports Social Bookmarking for multiple providers through its SocialMarks functionality.
• Math.ToFloat32 takes a JavaScript value and converts it to a Float32, whenever possible.
• There is no longer a prompt when websites use appcache.
• Support for the CSS image orientation property.
• New App Manager allows you to deploy and debug HTML5 webapps on Firefox OS phones and the Firefox OS Simulator.
• IndexedDB can now be used as an «optimistic» storage area so it doesn’t require any prompts and data is stored in a pool with LRU eviction policy, in short temporary storage.
• Fixed: When displaying a standalone image, Firefox matches the Exif orientation information contained within the JPEG image.
• Fixed: Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.
• Improved page load times due to no longer decoding images that are not visible.
• Fixed: AudioToolbox MP3 backend for Mac OS X.

• Fixed the screen that distorts on some devices after tapping on search suggestion.
• Fixed: About:home is missing translations in some locales. Most affected are: ca, ga-IE, hu, ko, pt-BR, pt-PT, ro, and uk.
• Fixed: In some cases, the clip set on the page doesn’t update when the addressbar hides.
• Fixed: Invalid position:fixed rendering.

End-of-life 26.0.x product line on February 4, 2014.

• You can now run more than one service at a time with Firefox SocialAPI, allowing you to receive notifications, chat and more from multiple integrated services.
• Enabled TLS 1.1 (RFC 4346) and TLS 1.2 (RFC 5246) by default.
• Added support for SPDY 3.1 protocol.
• Ability to reset style sheets using all:unset.
• You can now choose to deobfuscate javascript in the debugger.
• Added support for scrolled fieldsets.
• Implemented allow-popups directive for iframe sandbox, enabling increased security.
• CSS cursor keywords -moz-grab and -moz-grabbing have been unprefixed.
• Added support for ES6 generators in SpiderMonkey.
• Implemented support for mathematical function Math.hypot() in ES6.
• Dashed line support on Canvas.
• Had Azure/Skia content rendering working on Linux.

• Fixed stability issues with Greasemonkey and other JavaScript that used ClearTimeoutOrInterval.
• Fixed: JavaScript math correctness issue.

End-of-life 27.0.x product line on March 18, 2014.

• VP9 video decoding implemented.
• Mac OS X: Notification Center support for web notifications.
• Volume control for HTML5 audio/video.
• Support for Opus in WebM.
• Now that SPDY/3 is implemented support for SPDY/2 has been removed and servers without SPDY/3 will negotiate to HTTP/1 without any penalty.
• Support for MathML 2.0 ‘mathvariant’ attribute.
• Background thread hang reporting.
• Support for multi-line flexbox in layout.

Off-cycle stability mobile update.^[158]

• Fixed H.264 video playback issues on several Galaxy devices.
• Fixed mobile-only security fix for file:paths.

End-of-life 28.0.x product line on April 29, 2014.

• Significant new customization mode.
• A new menu sits in the right hand corner of Firefox and includes popular browser controls.
• New tabs provide an overall smoother look and fade into the background when not active.
• An interactive onboarding tour to guide users through the new Firefox changes.
• Added the ability to set up Firefox Sync by creating a Firefox account.
• Gamepad API finalized and enabled.
• Malay [ma] locale added.
• Clicking on a W3C Web Notification will switch to the originating tab.
• ‘box-sizing’ (dropping the -moz- prefix) implemented.
• Console object available in web workers.
• Promises enabled by default.
• SharedWorker enabled by default.
• <input type="number"> implemented and enabled.
• <input type="color"> implemented and enabled.
• Enabled ECMAScript Internationalization API.
• Add-on bar has been removed, content moved to navigation bar.
• No longer possible to move tabs from the top of the browser without an add-on.

• Fixed: An issue with pdf.js printing white pages.
• Fixed: Tabs not visible with dark themes under Windows 8.1.
• Fixed: Session Restore failed with a corrupted sessionstore.js file.
• Fixed: Seer disabled by default.

End-of-life 29.0.x product line on June 10, 2014.

• Sidebars button in browser chrome enables faster access to social, bookmark, & history sidebars.
• Mac OS X command-E sets find term to selected text.
• Support for GStreamer 1.0.
• Disallowed calling WebIDL constructors as functions on the web.
• With the exception of those bundled inside an extension or ones that are whitelisted, plugins will no longer be activated by default.
• Fixes to box-shadow and other visual overflow.
• Mute and volume available per window when using WebAudio.
• Background-blend-mode enabled by default.
• Use of line-height allowed for <input type="reset|button|submit">.
• ES6 array and generator comprehensions implemented.
• Error stack now contains column number.
• Support for alpha option in canvas context options.
• Fixed: Ignored autocomplete=»off» when offering to save passwords via the password manager.
• Fixed TypedArrays that don’t support new named properties.

End-of-life 30.0.x product line on July 22, 2014.

• Adds the search field to the new tab page.
• mozilla::pkix as default certificate verifier.
• Blocks malware from downloaded files.
• Partial implementation of the OpenType MATH table.
• Support of Prefer:Safe http header for parental control.
• audio/video .ogg and .pdf files handled by Firefox if no application specified (Windows only).
• Upper Sorbian [hsb] locale added.
• Removal of the CAPS infrastructure for specifying site-specific permissions (via capability.policy.* preferences). Most notably, attempts to use this functionality to grant access to the clipboard will no longer work. The sole exception is the checkloaduri permission, which may still be used as before to allow sites to load file:// URIs.
• WebVTT implemented and enabled.
• CSS3 variables implemented.
• Developer Tools: Add-on Debugger.
• Developer Tools: Canvas Debugger.
• New Array built-in: Array.prototype.fill().
• New Object built-in: Object.setPrototypeOf().
• CSP 1.1 nonce-source and hash-source enabled by default.
• Developer Tools: Eyedropper tool added to the color picker.
• Developer Tools: Editable Box Model.
• Developer Tools: Code Editor improvements.
• Developer Tools: Console stack traces.
• Developer Tools: Copy as cURL.
• Developer Tools: Styled console logs.
• navigator.sendBeacon enabled by default.
• Dialogs spawned from the onbeforeunload event no longer block access to the rest of the browser.
• Fixed: Search for partially selected link text from context menu.
• Last release for Android 2.2 for ARMv7 devices.

End-of-life 31.0.x product line on September 2, 2014.

• Fixed: Invalid certificate issue with mozilla::pkix.
• Fixed: Importing an RSA private key fails if p < q.

• Fixed: @ JS::Handle::operator JSObject* const&() startup crash.
• Fixed: Intermittent failures in add-ons manager mochitest-browser tests.
• Fixed: Bad CPU type in executable running mochitests on Mac OS X Yosemite.
• Fixed: Error building nsChildView.mm on Mac OS X Yosemite.
• Fixed: Build error on Mac OS X Yosemite.
• Fixed: Wrong CPU features detection on some x86 CPUs.
• Fixed: XMLHttpRequest.send({}) should not throw.
• Last release for Android for ARMv6 devices.

• New HTTP cache provides improved performance including crash recovery.
• Integration of generational garbage collection.
• Public key pinning support enabled.
• Displays the number of found items in the find toolbar.
• Easier back, forward, reload, and bookmarking through the context menu.
• Views historical use information for logins stored in password manager.
• Lower Sorbian [dsb] locale added.
• Removed and turned off trust bit for some 1024-bit root certificates.
• Performance improvements to Password Manager and Add-on Manager.
• drawFocusIfNeeded enabled by default.
• CSS position:sticky enabled by default.
• mix-blend-mode enabled by default.
• Vibration API updated to latest W3C spec.
• box-decoration-break enabled by default.
• ECMAScript 6 built-in method Array#copyWithin implemented.
• New Array built-in: Array.from()
• navigator.languages property and languagechange event implemented.
• CSS box-decoration-break replaces -moz-background-inline-policy.
• HiDPI support in Developer Tools UI.
• Inspector button moved to the top left.
• Hidden nodes displayed differently in the markup-view.
• New Web Audio Editor.
• Code completion and inline documentation added to Scratchpad.
• Fixed: Mac OS X: cmd-L does not open a new window when no window is available.
• Fixed Text Rendering Issues on Windows 7 with Platform Update KB2670838 (MSIE 10 Prerequisite) or on Windows 8.1.

Desktop^[187]

• Fixed stability issues for computers with multiple graphics cards.
• Fixed mixed content icon that may be incorrectly displayed instead of lock icon for SSL sites.
• Fixed: WebRTC: setRemoteDescription() silently fails if no success callback is specified.

Android^[188]

• Fixed link tap selection that was offset on some Android devices.

Off-cycle stability update.^[189]

• Fixed corrupt installations causing Firefox to crash on update.

End-of-life 32.0.x product line on October 14, 2014.

• Windows: OMTC enabled by default.
• OpenH264 support (sandboxed).
• Improved search experience through the location bar.
• Slimmer and faster JavaScript strings.
• Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages.
• New CSP (Content Security Policy) backend.
• Support for connecting to HTTP proxy over HTTPS.
• Improved reliability of the session restoration.
• Azerbaijani [az] locale added.
• Proprietary window.crypto properties/functions removed.
• JSD (JavaScript Debugger Service) removed in favor of the Debugger interface.
• @counter-style rule from CSS3 Counter Styles specification implemented.
• DOMMatrix interface implemented.
• Cubic-bezier curves editor.
• Displayed which elements have listeners attached.
• New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet.
• Paint flashing for browser content repaints.
• Editable @keyframes rules in the Rules section of the Inspector.
• CSS transform highlighter in the style-inspector.
• Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.

Off-cycle stability update.^[192]

• Fixed displaying of a black screen at startup with certain graphics drivers.

Off-cycle stability update.^[193]

• Fixed a startup crash with some combination of hardware and drivers.

Off-cycle stability update.^[194]

• Blacklisted graphics drivers that were causing black screens with OMTC enabled.
• Fixed two startup crashes with some combination of hardware and drivers.

• Forget button added.
• Enhanced tiles.
• Privacy tour introduced.
• Adding DuckDuckGo as a search option.

Off-cycle stability update.^[196]

• Fixed a startup crash.

End-of-life 33.x product line on December 1, 2014.

• Default search engine changed to Yandex for Belarusian, Kazakh, and Russian locales.
• Improved search bar (en-US only).
• Firefox Hello real-time communication client.
• Easily switch themes/personas directly in the Customizing mode.
• Wikipedia search now uses HTTPS for secure searching (en-US only).
• Implementation of HTTP/2 (draft14) and ALPN.
• Recover from a locked Firefox process in the «Firefox is already running» dialog on Windows.
• Disabled SSLv3.
• Proprietary window.crypto properties/functions re-enabled (to be removed in Firefox 35).
• Firefox signed by Apple OS X version 2 signature.
• ECMAScript 6 WeakSet Implemented.
• JavaScript Template Strings Implemented.
• CSS3 Font variants and features control (e.g. kerning) implemented.
• WebCrypto:
  • RSA-OAEP, PBKDF2, ECDH, and AES-KW support.
  • wrapKey and unwrapKey implemented.
  • Import/export of JWK-formatted keys.
• matches() DOM API implemented (formerly mozMatchesSelector()).
• Performance.now() for workers implemented.
• WebIDE: Create, edit, and test a new Web application from your browser.
• Highlight all nodes that match a given selector in the Style Editor and the Inspector’s Rules panel.
• Improved User Interface of the Profiler.
• console.table function added to web console.
• Fixed: CSS transitions start correctly when started at the same time as changes to display, position, overflow, and similar properties.

Official Firefox 34.0.5 release.^[197]

• Default search engine changed to Yahoo! for North America.

End-of-life 34.0.x product line on January 13, 2015.

• Firefox Hello with new rooms-based conversations model.
• New search UI improved and enabled for more locales.
• Access the Firefox Marketplace from the Tools menu and optional toolbar button.
• Built-in support for H264 (MP4) on Mac OS X Snow Leopard (10.6) and newer through native APIs.
• Use of tiled rendering on Mac OS X.
• Improved high quality image resizing performance.
• Improved handling of dynamic styling changes to increase responsiveness.
• Implemented HTTP Public Key Pinning Extension (for enhanced authentication of encrypted connections).
• Added support for the CSS Font Loading API.
• Resource Timing API implemented.
• CSS filters enabled by default.
• Changed JavaScript ‘let’ semantics to match the ES6 specification.
• Support for inspecting ::before and ::after pseudo elements.
• Computed view: Nodes matching the hovered selector are now highlighted.
• Network Monitor: New request/response headers view.
• Added support for the EXT_blend_minmax WebGL extension.
• Fixed: Show DOM Properties context menu item in inspector.
• Reduced resource usage for scaled images.
• PDF.js updated to version 1.0.907.
• Non-HTTP(S) XHR now returns correct status code.

Changes during Developer Edition releases

• Renamed to Firefox Developer Edition for alpha «Aurora» releases since November 10, 2014.^[198][199]

• Fixed a crash with the Enhanced Steam extension.
• Fixed a potential startup crash.
• Fixed Kerberos authentication failure with alias.
• Fixed SVG / CSS animation regression causing rendering issues on websites like openstreetmap.org.
• Fixed a crash on Godaddy webmail.
• Fixed an update failure of document.baseURI to document.location after base tag was removed from DOM for site with a CSP.
• Fixed a text selection broken with a Right-to-left (RTL) version of Firefox.
• CSP had a change in behavior with regard to case sensitivity resources loading.

Android

• Fixed crash with video playback on Asus MeMO Pad 10 and 8, Tesco Hudl, Lenovo Lifetab E models, and several other devices running the Rockchip SoC.

End-of-life 35.0.x product line on February 24, 2015.

• Pinned tiles on the new tab page can be synced.
• Added full support for HTTP/2.
• Locale added: Uzbek (UZ).
• Remote option removed.
• No longer accepting insecure RC4 ciphers whenever possible.
• Phasing out Certificates with 1024-bit RSA Keys.
• Shut down hangs will now show the crash reporter before exiting the program.
• Add-on compatibility changed.
• Support for the ECMAScript 6 Symbol data type added.
• Unicode-range CSS descriptor implemented.
• CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries.
• Object-fit and object-position implemented.
• Isolation CSS property implemented.
• CSS3 will-change property implemented.
• Changed JavaScript ‘const’ semantics to conform better to the ES6 specification.
• Improved ES6 generators for better performance.
• Eval sources now appear in the Debugger.
• DOM Promises inspection.
• Inspector: More paste options in markup view.
• CSS gradients work on premultiplied colors.
• Fixed some unexpected logout from Facebook or Google after restart.

• Disabled the usage of the ANY DNS query type.
• Fixed a startup crash with EMET.
• Fixed the Hello contact that may become inactive until restart.
• Fixed print preferences that may not be preserved.
• Fixed Hello contact tabs that may not be visible.
• Accepted hostnames that include an underscore character _.
• Fixed the WebGL that may use significant memory with Canvas2d.
• Option -remote has been restored.
• Fixed a top crash.

Off-cycle stability mobile update.^[203]

• Fixed a startup crash on HTC One M8 devices (Verizon) with Android 5.0.1.
• Fixed some potential crashes with Flash videos.

• Security fix for an issue disclosed at HP Zero Day Initiative’s Pwn2Own contest.

• Security fix for an issue disclosed at HP Zero Day Initiative’s Pwn2Own contest.

End-of-life 36.0.x product line on March 31, 2015.

• Heartbeat user rating system – your feedback about Firefox.
• Yandex set as default search provider for the Turkish locale.
• Bing search now uses HTTPS for secure searching.
• Improved protection against site impersonation via OneCRL centralized certificate revocation.
• Opportunistically encrypts HTTP traffic where the server supports HTTP/2 AltSvc.
• Disabled insecure TLS version fallback for site security.
• Extended SSL error reporting for reporting non-certificate errors.
• TLS False Start optimization now requires a cipher suite using AEAD construction.
• Improved certificate and TLS communication security by removing support for DSA.
• Improved performance of WebGL rendering on Windows.
• Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
• Added support for CSS display:contents.
• IndexedDB now accessible from worker threads.
• New SDP/JSEP implementation in WebRTC.
• Debug tabs opened in Chrome Desktop, Chrome for Android, and Safari for iOS.
• New Inspector animations panel to control element animations.
• New Security Panel included in Network Panel.
• Debugger panel support for chrome:// and about:// URIs.
• Added logging of weak ciphers to the web console.

• Disabled HTTP/2 AltSvc introduced in 37.0 due to security issues.

Desktop

• Fixed start-up crash due to graphics hardware and third-party software.

Android

• Fixed crash due to WebRTC usage on certain web sites.

Desktop

• Fixed an issue with Google Maps rendering incorrectly in some cases.
• Fixed stability issues for some graphics hardware and feature sets.
• Security fixes.

Android

• Fixed an issue related to the «request desktop site» feature.

End-of-life 37.0.x product line on May 12, 2015.

• New tab-based preferences.
• Ruby annotation support.
• Base for the next ESR release.
• autocomplete=off is no longer supported for username/password fields.
• URL parser avoids doing percent encoding when setting the Fragment part of the URL, and percent decoding when getting the Fragment in line with the URL spec.
• RegExp.prototype.source now returns «(?:)» instead of the empty string for empty regular expressions.
• Improved page load times via speculative connection warmup.
• WebSocket now available in web workers.
• BroadcastChannel API implemented.
• Implemented srcset attribute and <picture> element for responsive images.
• Implemented DOM3 Events KeyboardEvent.code.
• Mac OS X: Implemented a subset of the Media Source Extensions (MSE) API to allow native HTML5 playback on YouTube.
• Implemented Encrypted Media Extensions (EME) API to support encrypted HTML5 video/audio playback (Windows Vista or later only).
• Automatically downloaded Adobe Primetime Content Decryption Module (CDM) for DRM playback through EME (Windows Vista or later only).
• Optimized-out variables are now visible in Debugger UI.
• XMLHttpRequest logs in the web console are now visually labelled and can be filtered separately from regular network requests.
• WebRTC now has multistream and renegotiation support.
• copy command added to console.

Desktop

• Fixed a crash on start-up with first generation NVidia Optimus graphics cards.
• Fixed a problem in which users who import cookies from Google Chrome can end up with broken websites.
• Fixed a problem that large animated images may fail to play and may stop other images from loading.
• Fixed a problem that WebRTC H264 video streams from CiscoSpark native clients are not decoded correctly (Fixed in Firefox ESR 38.0.1; was already fixed in Firefox 38.0).

Android

• Fixed a crash on start-up on devices for which Firefox does not support Android hardware acceleration.
• Fixed a problem that large animated images may fail to play and may stop other images from loading.
• Fixed a problem that Mozilla Location Service (MLS) stumbler may not submit all data.

Desktop

• Integration of Pocket.
• Implementation of Reader View.
• Share the active tab or window in a Hello conversation.
• Fixed a problem that would cause Firefox to stop painting when switching tabs.
• Fixed graphics performance when using the built-in VGA driver on Windows 7.

Android

• Integrated Adjust SDK to measure aggregate installs.
• Fixed various stability fixes.

End-of-life 38.0.x product line on July 2, 2015.

Off-cycle update.

• Fixes bugs in Firefox 38.0.5 funnelcake builds.

Note: This release is only available from the Mozilla archives.

End-of-life 38.0.x product line on July 2, 2015.

• Patches zero-day exploit.^[231]

• Fixed: Firefox may become unresponsive after right-clicking Flash content on Windows 8.
• Fixed: Firefox may crash during mp4 video playback.
• Fixed branded Firefox application that does not open URLs in system default browser.
• Fixed significant memory leak with GreaseMonkey add-on.
• Fixed crash [@ RtlEnterCriticalSection | MessageLoop::PostTask_Helper] on browser shutdown.
• Fixed browser UI that becomes unresponsive state when using Unity Web Player Plugin.
• Fixed ESRs that would not build on hppa platform.
• Fixed crash in mozilla::layers::SyncObjectD3D11::FinalizeFrame().

• Improved stability with Java.

• Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.

• Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.

• Updated graphite2 library to latest release.

• Fixed an issue in which loading from history can show the wrong url in the location bar.
• Disabled Graphite font shaping library.

• Share Hello URLs with social networks.
• Project Silk for Mac OS X: Smoother animation and scrolling.
• Support for ‘switch’ role in ARIA 1.1 (web accessibility).
• SafeBrowsing malware detection lookups enabled for downloads on Mac OS X and Linux.
• Support for new Unicode 8.0 skin tone emoji.
• Removed support for insecure SSLv3 for network communications.
• Disable use of RC4 except for temporarily whitelisted hosts.
• The malware detection service for downloads now covers common Mac file types.
• Performance of displaying dashed lines is improved on Mac OS X.
• List-style-type now accepts a string value.
• Enable the Fetch API for network requests from dedicated, shared and service workers.
• Cascading of CSS transitions and animations now matches the current spec.
• Implement <link rel=»preconnect»>allowing anticipation of a future connection without revealing any information.
• Added support for CSS Scroll Snap Points.
• Drag and drop enabled for nodes in Inspector markup view.
• Webconsole input history persists even after closing the toolbox.
• Cubic bezier tooltip now shows a gallery of timing-function presets for use with CSS animations.
• localhost is now available offline for WebSocket connections.
• Improve performance for IPv6 fallback to IPv4.
• Fixed incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers.
• Fixed the security state indicator on a page now correctly ignores loads caused by previous pages.
• Fixed an issue where a Hello conversation window would sometimes fail to open.
• Fixed a regression that could lead to Flash not displaying has been fixed.
• Update to NSS 3.19.2.

• Patches zero-day exploit.^[231]

End-of-life 39.0.x product line on August 11, 2015.

• Support for Windows 10.
• Added protection against unwanted software downloads.
• User can receive suggested tiles in the new tab page based on categories Firefox matches to browsing history (en-US only).
• Hello allows adding a link to conversations to provide context on what the conversation will be about.
• New style for add-on manager based on the in-content preferences style.
• Improved scrolling, graphics, and video playback performance with off-main-thread compositing (Linux only).
• Graphic blocklist mechanism improved: Firefox version ranges can be specified, limiting the number of devices blocked.
• Add-on extensions that are not signed by Mozilla will display a warning.
• NPAPI Plug-in performance improved via asynchronous initialization.
• Smoother animation and scrolling with hardware vsync (Windows only).
• JPEG images use less memory when scaled and can be painted faster.
• Sub-resources can no longer request HTTP authentication, thus protecting users from inadvertently disclosing login data.
• IndexedDB transactions are now non-durable by default.
• Implemented AudioBufferSourceNode.detune to modulate playback rate in cents, a logarithmic unit of measure used for musical intervals.
• Improved Performance tools in the developer tools: Waterfall view, Call Tree view and a Flame Chart view.
• New rules view tooltip in the Inspector to tweak CSS Filter values.
• Console API messages from SharedWorker and ServiceWorker are now displayed in web console.
• New page ruler highlighting tool that displays lightweight horizontal and vertical rules on a page.
• Inspector now searches across all content frames in a page.
• Fixed Kannada text that does not display properly in built-in pdf viewer.

Off-cycle stability update.^[244]

• Enabled API allowing Windows 10 users to open settings dialog.
• Fixed mozalloc.lib that was missing from the xulrunner package.
• Fixed a startup crash with some combination of hardware and drivers.

• Disabled the asynchronous plugin initialization.
• Fixed a segmentation fault in the GStreamer support (Linux only).
• Fixed a startup crash when using DisplayLink (Windows only).
• Fixed a regression with some Japanese fonts used in the <input> field.
• Fixed an issue that the selection in a select combox box using the mouse could be broken on some sites.
• Fixed an issue that some search partner codes were missing.

End-of-life 40.0.x product line on September 22, 2015.

• Enhanced IME support on Windows (Vista +) using TSF (Text Services Framework).
• Ability to set a profile picture for your Firefox Account.
• Firefox Hello now includes instant messaging.
• SVG images can be used as favicons.
• Improved box-shadow rendering performance.
• WebRTC now requires perfect forward secrecy.
• WARP is disabled on Windows 7.
• Updates to image decoding process.
• Support for running animations of ‘transform’ and ‘opacity’ on the compositor thread.
• MessageChannel and MessagePort API enabled by default.
• Added support for the transform-origin property on SVG elements.
• CSS Font Loading API enabled by default.
• Navigator.onLine now varies with actual internet connectivity (Windows and Mac OS X only).
• Copy/Cut Web content from JavaScript to the OS clipboard with document.execCommand("cut"/"copy").
• Implemented Cache API for querying named caches that are accessible Window, Worker, and ServiceWorker.
• Removed support for binary XPCOM components in extensions, use addon SDK «system/child_process» pipe mechanism for native binaries instead.
• Network requests can be exported in HAR format.
• Quickly adds new CSS rule with New Rule button in the Inspector.
• Screenshots a node or element from markup view with the Screenshot Node context menu item.
• Copies element CSS rule declarations with the Copy Rule Declaration context menu item in the Inspector.
• Pseudo-Class panel in the Inspector.
• Fixed an issue where picture element does not react to resize/viewport changes.

Off-cycle stability update.^[247]

• Fixed a startup crash related to Yandex toolbar and Adblock Plus.
• Fixed potential hangs with Flash plugins.
• Fixed a regression in the bookmark creation.
• Fixed a startup crash with some Intel Media Accelerator 3150 graphic cards.
• Fixed a graphic crash, occurring occasionally on Facebook.

• Private Browsing with Tracking Protection that blocks certain Web elements that could be used to record your behavior across sites.
• Control Center that contains site security and privacy controls.
• Indicator added to tabs that play audio with one-click muting.
• WebRTC improvements:
  • IPV6 support.
  • Preferences for controlling ICE candidate generation and IP exposure.
  • Hooks for extensions to allow/deny createOffer/Answer.
  • Improved ability for applications to monitor and control which devices are used in getUserMedia.
• Login Manager improvements:
  • Improved heuristics to save usernames and passwords.
  • Editing and showing all logins in line, Copy/Paste usernames/passwords from the Context menu.
  • Migration imports your passwords to Firefox from Google Chrome for Windows and Internet Explorer; import anytime from the Login Manager.
• Improved performance on interactive websites that trigger a lot of restyles.
• Implemented ES6 Reflect.
• Support for ImageBitmap and createImageBitmap().
• Media Source Extension for HTML5 video available for all sites.
• Viewing HTML source in a tab.
• Remote website debugging over WiFi (no USB cable or ADB needed).
• Asynchronous call stacks now allow web developers to follow the code flow through setTimeout, DOM event handlers, and Promise handlers.
• Configurable Firefox OS Simulator in WebIDE, to simulate reference devices like phones, tablets, even TVs.
• CSS filter presets in the Inspector.
• Ability to save filter presets inside CSS Filter Tooltip.

End-of-life 42.0.x product line on December 15, 2015.

• Private Browsing with Tracking Protection offers choice of blocking additional trackers.
• Improved API support for m4v video playback.
• Firefox 64-bit for Windows is now available via the Firefox download page.
• Users can choose search suggestions from the Awesome Bar.
• On-screen keyboard displayed on selecting input field on devices running Windows 8 or greater.
• Firefox Health Report has switched to use the same data collection mechanism as telemetry.
• Markup view shows indicators for pseudo-classes locked for elements.
• Binding F1 key to open the settings when the toolbox is focused.
• New ‘Use in Console’ context menu item in Inspector to store selected element in a temporary variable.
• Search button next to overridden CSS properties to find similar properties in the rules view.
• Ability to filter styles from their property names in the rules view.
• Stack traces are now shown for exceptions inside the console.
• Added ability to display server-side logs in the console.
• Ability to choose resolution for the Graphical Command Line Interpreter (GCLI) screenshot command.
• Subresource integrity allows developers to make their sites more secure.
• Network requests in Console now link to Network panel instead of opening in a popup.
• Unprefixed ‘hyphens’ property is now supported.
• WebIDE now has a sidebar-based UI.
• The ‘transform-origin’ property is now supported on SVG elements.
• Animation inspector now displays animations in a timeline.
• Single-process mode is no longer supported for NPAPI plugins.
• Fixed an issue in which the Eyedropper tool does not work as expected when page is zoomed.
• Various security fixes.

Off-cycle stability update.^[249]

• Preparing to use SHA-256 signing certificate for Windows builds, to meet new signing requirement.

Off-cycle security and stability update.^[250]

• Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.

Off-cycle stability update.^[251]

• Fixed network issue when using Nvidia’s Network Access Manager.
• Improved the decoding of some videos on YouTube on some Windows configurations.

Off-cycle stability update.^[252]

• Fix for startup crash for users of a third party antivirus tool.
• Multi-user Linux download folders can be created.
• Re-enabled SHA-1 certificates.
• The last version to support HTTP cookie prompts.

End-of-life 43.0.x product line on January 26, 2016.

• Improved warning pages for certificate errors and untrusted connections.
• Enabled H.264 if system decoder is available.
• Enabled WebM/VP9 video support on systems that don’t support MP4/H.264.
• In the animation-inspector timeline, lightning bolt icon next to animations running on the compositor thread.
• Support for the brotli compression format via HTTPS content-encoding.
• Screenshot commands allow user choice of pixel ratio in Developer Tools.
• Fixed an issue where Windows XP and Vista screensaver doesn’t disable when watching videos.
• Various security fixes.
• To support unicode-range descriptor for webfonts, font matching under Linux now uses the same font matching code as other platforms.
• Use of a SHA-256 signing certificate for Windows builds, to meet new signing requirements.
• Firefox has removed support for the RC4 decipher.
• Firefox will no longer trust the Equifax Secure Certificate Authority 1024-bit root certificate or the UTN – DATACorp SGC to validate secure website certificates.
• Stricter validation of web fonts.
• On-screen keyboard support temporarily turned off for Windows 8 and Windows 8.1.
• Right-clicking on a logged object in the console to store it as a global variable on the page.
• Visual tools for Animation:.
  • View/Edit CSS animation keyframe rules directly in the inspector.
  • Visually modify the cubic-bezier curve that drives the way animations progress through time.
  • Discover and scrub through all CSS animations and transitions playing on the page.
  • Learn more: http://devtoolschallenger.com/.
• Visual tools for Layout and Styles:
  • Display rulers along the viewport to verify size and position and use the measurement tool to easily detect spacing and alignment problems.
  • Use CSS filters to preview and create real-time effects like drop-shadows, sepia, etc..
  • Learn more: http://devtoolschallenger.com/.
• New memory tool for inspecting the memory heap.
• Service Workers API.
• Built-in JSON reader to intuitively view, search, copy and save data without extensions.
• A jump to function definitions in the debugger with Cmd-Click.
• WebSocket Debugging API and add-on.
• The rule view now displays styles using their authored text, and edits in the rule view are now linked to the style editor.

Changes during Nightly releases

• This and newer versions erase the cookie permissions database of any previous Firefox version.

Off-cycle stability update.^[253]

• Fixed an issue which could lead to the removal of stored passwords under certain circumstances.
• Allows spaces in cookie names.
• Requires NSS 3.21.
• Fixed a crash in cache networking.
• Fix for using WebSockets in service worker controlled pages.
• Disabled opus/vorbis audio with H.264.
• Shipment for the Gecko SDK.
• Fix for graphics startup crash on Linux.

• Fixed an issue where Firefox hangs or crashes on startup.

End-of-life 44.0.x product line on March 8, 2016.

• Instant browser tab sharing through Hello.
• Tabs synced via Firefox Accounts from other devices are now shown in dropdown area of Awesome Bar when searching.
• Synced Tabs button in button bar.
• Introduces a new preference (network.dns.blockDotOnion) to allow blocking .onion at the DNS level.
• Guarani [gn] locale added.
• URLs containing a Unicode-format Internationalized Domain Name (IDN) are now properly redirected.
• Various security fixes.
• Tab Groups (Panorama) feature removed.
• Ability to filter snapshot output in memory tool.
• Fine-tuning animations by changing the playback rate of animations in the animation-inspector’s timeline.
• DOMContentLoaded and load events shown in the network monitor timeline.
• Added Negative url filtering for the network monitor.
• Support for diffing heap snapshots added to the memory tool.
• Inspector search now matches results from all content in the page, including subframes.
• List of animated properties and keyframes is now displayed when clicking on an animation in the animation-inspector’s timeline.
• Push API support, part of Progressive Web Applications.
• Support for delivery of a Content Security Policy (CSP) via a meta tag.
• Web Speech synthesis API.
• ES6 Classes.

• Fix for a potential performance regression (YouTube for example).
• Fix for a regression causing search engine settings to be lost in some context.
• Brings back non-standard jar: URIs to fix a regression in IBM iNotes.
• Fixed an issue in which XSLTProcessor.importStylesheet was failing when <import> was used.
• Fix for an issue which could cause the list of search provider to be empty.
• Fix for a regression when using the location bar.
• Fix for some loading issues when Accept third-party cookies: was set to Never.
• Disabled Graphite font shaping library.

• Fix for an issue impacting the cookie header when third-party cookies are blocked.
• Fix for a web compatibility regression impacting the srcset attribute of the image tag.
• Fix for a crash impacting the video playback with Media Source Extension.
• Fix for a regression impacting some specific uploads.

Desktop

• Fix for a regression with the copy and paste with some old versions of some Gecko applications like Thunderbird.

Android

• Last release for Android 3.x

End-of-life 45.0.x product line on April 26, 2016.

Same changelog of 45.0.1

Same changelog of 45.0.2

• Fixed a build issue when jit is disabled.
• Fixed add-on signing certificate expiration.
• Fixed a graphics-related shutdown crash.

• Fixed graphics-related crashes.
• Fixed unicode support for AutoConfig API.
• Web compatibility fix for addEventListener API.

• Improved security of the JavaScript Just In Time (JIT) Compiler
• GTK3 integration (Linux only)
• Screen reader behavior with blank spaces in Google Docs corrected
• Corrected rendering for scaled SVGs that use a clip and a mask
• WebRTC fixes to improve performance and stability
• Display of dominator trees in Memory tool
• Allocation and garbage collection pause profiling in the performance panel
• Launch of responsive mode from the Style Editor @media sidebar
• Added support for document.elementsFromPoint
• Added HKDF support for Web Crypto API^{[citation needed]}

• Fixed add-on signing certificate expiration.
• Fixed service worker update issue.
• Fixed a build issue when jit is disabled.
• Fixed a page loading issue related to antivirus software.
• Searched a plugin issue for various locales.
• Limited Sync registration updates.

End-of-life 46.0.x product line on June 7, 2016.

• Support for Google’s Widevine CDM on Windows and Mac OS X so streaming services like Amazon Video can switch from Silverlight to encrypted HTML5 video.
• Enabled VP9 video codec for users with fast machines
• Embedded YouTube videos now play with HTML5 video if Flash is not installed.
• Ability to view and search open tabs from your smartphone or another computer in a sidebar
• Allowed no-cache on back/forward navigations for https resources
• Latgalu [ltg] locale added.
• Various security fixes
• FUEL (Firefox User Extension Library) has been removed. Add-ons relying on it will stop working.
• The browser.sessionstore.restore_on_demand preference has been reset to its default value (true) to avoid e10s performance problems.
• The Firefox click-to-activate plugin whitelist has been removed.
• Web platform changes
• Ability to view, start, and debug registered Service Workers in the Service Workers developer tool
• Ability to simulate Push messages in the Service Workers developer tool
• ‘Start’ button for service workers in about:debugging to start registered Service Workers
• Changes that can affect add-on compatibility
• Added support for ChaCha20/Poly1305 cipher suites
• Custom user agents supported in Responsive Design Mode
• Smart multi-line input in the Web Console
• cuechange events are now available on TextTrack objects
• WebCrypto: PBKDF2 supports SHA-2 hash algorithms
• WebCrypto: RSA-PSS signature support

Android

• Last release to support Android 2.3.x (Gingerbread)

Off-cycle stability update.^[287]

• Fixed an issue in which Selenium WebDriver may cause Firefox to crash at startup.

• Detect SSE hardware version.
• Detect Websense to protect users from a startup crash.

End-of-life 47.0.x product line on November 1, 2016.

• Roar for moar protection against harmful downloads! We’ve got your back.
• Process separation (e10s) is enabled for some of you. Like it? Let us know and we’ll roll it out to more.
• Add-ons that have not been verified and signed by Mozilla will not load.
• Linux fans: Get better Canvas performance with speedy Skia support. Try saying that three times fast.
• WebRTC embetterments:
  • Delay-agnostic AEC enabled.
  • Full duplex for Linux enabled.
  • ICE Restart & Update is supported.
  • Cloning of MediaStream and MediaStreamTrack is now supported.
• Searching for something already in your bookmarks or open tabs? We added super smart icons to let you know.
• Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode (Windows only).
• The media parser has been redeveloped using the Rust programming language.
• Heyo, Jabra & Logitech C920 webcam users. Fixed WebRTC bugs causing frequency distortions.
• Improved step debugging on last line of functions.
• After version 48, SSE2 CPU extensions are going to be required on Windows.
• Au revoir to Windows Remote Access Service modem Autodial.
• WebExtensions support is now considered as stable.
• Want to move absolute & fixed positioned elements? Now you can with our geometry editor.
• The memory tool now has a tree map view for your debugging pleasure.
• We’re putting the spotlight on the background. Now you can debug WebExtensions background content scripts and background pages.
• Content Security Policy (CSP) is now enforced for WebExtensions.
• Old and busted: Error Console. New hotness: Browser Console for your debugging pleasure.
• Add-on development just got easier because you can reload them from about:debugging – because we’re all about debugging.
• This theme is hot, hot, hot! Say hi to the Firebug theme for Developer Tools.
• Expanded network requests from the console panel to view request details in line, so you can see things in context.
• Workers can now use the Web Crypto API.

Off-cycle stability update.^[289]

• Fix for an audio regression impacting some major websites.
• Fix for a top crash in the JavaScript engine.
• Fix for a startup crash issue caused by Websense.
• Fix for a different behavior with e10s / non-e10s on <select> and mouse events.
• Fix for a top crash caused by plugin issues.
• Fix for an unsigned add-ons issue on Windows.
• Fix for a shutdown issue.
• Fix for a crash in WebRTC.

Off-cycle stability update.^[290]

• Fix for a startup crash issue caused by Websense (Windows only).
• Last release for Mac OS X 10.6-10.8.

End-of-life 48.0.x product line on September 20, 2016.

• Updated Firefox Login Manager to allow HTTPS pages to use saved HTTP logins. It’s one more way Firefox is supporting Let’s Encrypt and helping users transition to a more secure web.
• Added features to Reader Mode that make it easier on the eyes and the ears.
  • Controls that allow users to adjust the width and line spacing of text.
  • Narrate, which reads the content of a page out loud.
• Improved video performance for users on systems that support SSSE3 without hardware acceleration.
• Added context menu controls to HTML5 audio and video that let users loops files or play files at 1.25x speed.
• Improved performance on OS X systems without hardware acceleration.
• Improved appearance of anti-aliased OS X fonts.
• Improvements in about:memory reports for tracking font memory usage.
• Improved performance on Windows systems without hardware acceleration.
• Fixed an issue that prevented users from updating Firefox for Mac unless they originally installed Firefox. Now, those users as well as any user with administrative credentials can update Firefox.
• Ended Firefox for Mac support for OS X 10.6, 10.7, and 10.8.
• Ended Firefox for Windows support for SSE processors.
• Removed Firefox Hello.
• Re-enabled the default for Graphite2 font shaping.
• Added a Cause column to the Network Monitor to show what caused each network request.
• Introduced web speech synthesis API.

Off-cycle stability update.^[291]

• Mitigated a startup crash issue caused by Websense (Windows only).

• Asynchronous rendering of the Flash plugins for desktop is now enabled by default. This should improve performance and reduce crashes for sites that use the Flash plugin.
• Changed D3D9 default fallback preference to prevent graphical artifacts.
• Fixed a network issue that prevents some users from seeing the Firefox UI on startup.
• Fixed a web compatibility issue with Array.prototype.values
• Fixed a web compatibility issue with file uploads on Android.
• Diagnostic information on timing for tab switching.
• Fix for a Canvas filters graphics issue affecting HTML5 apps.

End-of-life 49.0.x product line on November 15, 2016.

• Playback video on more sites without plugins with WebM EME Support for Widevine on Windows and Mac.
• Improved performance for SDK extensions or extensions using the SDK module loader.
• Added download protection for a large number of executable file types on Windows, Mac and Linux.
• Increased availability of WebGL to more than 98 percent of users on Windows 7 and newer.
• Added Guarani (gn) locale.
• Added option to Find in page that allows users to limit search to whole words only.
• Updates to keyboard shortcuts.
  • Set for a preference to have Ctrl+Tab cycle through tabs in recently used order.
  • View for a page in Reader Mode by using Ctrl+Alt+R (Command+Alt+R on Mac).
• Various security fixes.
• Blocked versions of libavcodec older than 54.35.1.
• Added a built-in Emoji set for operating systems without native Emoji fonts (Windows 8.0 and lower and Linux).
• Changes for web developers.

Android

• Added support for HLS videos via player overlay.
• Simplified the user interface by combining the Recent Tabs and History panels.

Off-cycle security and stability update.^[294]

• Fixed an issue where Firefox crashes with 3rd party Chinese IME when using IME text.

• Fixed a zero-day exploit in the wild among other exploits.

End-of-life 50.x.x product line on January 24, 2017.

• Added support for FLAC (Free Lossless Audio Codec) playback.
• Improved reliability of browser data sync.
• An even faster E10s! Tab Switching is better!
• Added Georgian (ka) and Kabyle (kab) locales.
• A warning is displayed when a login page does not have a secure connection.
• Added support for WebGL 2, with advanced graphics rendering features like transform feedback, improved texturing capabilities, and a new sophisticated shading language.
• Firefox will save passwords even in forms that do not have «submit» events.
• Improved video performance for users without GPU acceleration for less CPU usage and a better full screen experience.
• Added a zoom button in the URL bar:
  • Displays percent above or below 100 percent when a user has changed the page zoom setting from the default.
  • Lets users return to the default setting by clicking on the button.
• Users can view passwords in the save password prompt before saving them.
• Removed Belarusian (be) locale.
• Various security fixes.
• Updated to NSS 3.28.1.
• Re-enabled E10s support for Russian (ru) locale.
• Use of 2D graphics library (Skia) for content rendering on Linux.

Android

• Added Nepali (ne-NP), Bulgarian (bg) and Kabyle (kab) locales.

Off-cycle security and stability update.^[299]

• Fixed an issue in which multiprocess incompatibility did not correctly register with some add-ons.
• Fixed an issue in which geolocation was not working on Windows.

Off-cycle stability update.^[300]

• Fix for a crash caused by an Android library (Palette) on some x86 devices.

Off-cycle stability update.^[301]

• Fix for a build issue which was causing some crashes on some x86 architectures.

End-of-life 51.0.x product line on March 7, 2017.

• First release to implement WebAssembly.
• Added support for WebAssembly, an emerging standard that brings near-native performance to Web-based games, apps, and software libraries without the use of plugins.
• Added automatic captive portal detection, for easier access to Wi-Fi hotspots. When accessing the Internet via a captive portal, Firefox will alert users and open the portal login page in a new tab.
• Enabled multi-process Firefox for Windows users with touch screens
• Added user warnings for non-secure HTTP pages with logins. Firefox now displays a «This connection is not secure» message when users click into the username and password fields on pages that don’t use HTTPS.
• Implemented the Strict Secure Cookies specification which forbids insecure HTTP sites from setting cookies with the «secure» attribute. In some cases, this will prevent an insecure site from setting a cookie with the same name as an existing «secure» cookie from the same base domain.
• Enhanced Sync to allow users to send and open tabs from one device to another.
• Improved text input for third-party keyboard layouts on Windows. This will address some keyboard layouts that:
  • have chained dead keys.
  • input two or more characters with a non-printable key or a dead key sequence.
  • input a character even when a dead key sequence failed to compose a character.
• Removed support for Netscape Plugin API (NPAPI) plugins other than Flash. Silverlight, Java, Acrobat and the like are no longer supported.
• Removed Battery Status API to reduce fingerprinting of users by trackers.
• Improved experience for downloads:
  • Notification in the toolbar when a download fails.
  • Quick access to five most recent downloads rather than three.
  • Larger buttons for canceling and restarting downloads.
• Displaying (but allowing users to override) an «Untrusted Connection» error when encountering SHA-1 certificates that chain up to a root certificate included in Mozilla’s CA Certificate Program. (Note: Firefox continues to permit SHA-1 certificates that chain to manually imported root certificates.)
• Migrated Firefox users on Windows XP and Windows Vista operating systems to the extended support release (ESR) version of Firefox.
• When not using Direct2D on Windows, Skia is used for content rendering.
• Enabled CSS Grid Layout, opening up a world of new possibilities for graphic design.
• Redesigned Responsive Design Mode to include device selection, network throttling, and more.
• Improved security for screen sharing, which now shows a preview and no longer requires a whitelisted domain.

Android

• Reduced APK file size by more than 5 MB for faster download and installation.
• Display of media controls to pause or resume playback on the Android notification bar. This gives users easy access to controls and allows them to see when audio or video is playing (and consuming mobile data) on Firefox.

• Various security fixes.

• Fixed use of Nirmala UI as fallback font for additional Indic languages.
• Fix for loading tab icons on session restore.
• Fix for a crash on startup on Linux.
• Fix for new installs erroneously not prompting to change the default browser setting.

Android

• Disabled presentation API to avoid page loading delays.
• Display of end-of-life message on non-NEON devices.

End-of-life 52.0.x product line on April 19, 2017.

Same changelog of 52.0.1

Same changelog of 52.0.2

• Various security, stability, and regression fixes.

• Various security fixes.

• Fixed hangs when using a proxy with NTLM authentication.

• Various security fixes
• Improved file type recognition on Windows

• Fixed an issue in which printing text does not work on Windows when Direct2D is disabled

• Various security fixes
• Various stability and regression fixes

• Various security fixes
• Various stability and regression fixes

• Fixed a crash when using the color picker on macOS 10.13
• Fixed a crash when playing videos on macOS 10.13

• Various security fixes
• Various stability and regression fixes

• Various security fixes

• Fix for a crash reporting issue that inadvertently sends background tab crash reports to Mozilla without user opt-in

• Various stability and regression fixes
• Various security fixes

• Various stability and regression fixes
• Various security fixes

• Fixed an issue in which the search is broken for Italian «it» locale in Firefox ESR 52.7.0

• Various security fixes

• Various security fixes

• Fix for compatibility with Windows 10 April 2018 update.

• Various stability and regression fixes
• Performance improvements to the Safe Browsing service to avoid slowdowns while updating site classification data

• Various security fixes

• Various security fixes
• Last release for Windows XP and Windows Vista.
• Last release for 32-bit Mac OS X.

End-of-life 52.x.x ESR product line on September 5, 2018.

• Improved graphics stability for Windows users with the addition of compositor process separation (Quantum Compositor).
• Two new ‘compact’ themes available in Firefox, dark and light, based on the Firefox Developer Edition theme.
• Lightweight themes are now applied in private browsing windows.
• Reader Mode now displays estimated reading time for the page.
• Windows 7+ users on 64-bit OS can select 32-bit or 64-bit versions in the stub installer.
• Various security fixes.
• Updated the design of site permission requests to make them harder to miss and easier to understand.
• Windows XP and Vista are no longer supported. XP and Vista users running Firefox 52 will continue to receive security updates on Firefox ESR 52.
• 32-bit Mac OS X is no longer supported. 32-bit Mac OS X users can switch to Firefox ESR 52 to continue receiving security updates..
• Updates for Mac OS X are smaller in size compared to updates for Firefox 52.
• The last few characters of shortened tab titles fade out instead of being replaced by ellipses to keep more of the title visible.
• Ended Firefox Linux support for processors older than Pentium 4 and AMD Opteron
• New visual design for audio and video controls.
• Support for WebM video with alpha, which allows playing videos with transparent backgrounds.
• Changes for web developers.

Android

• Right to Left Language Support – Arabic (ar), Urdu (ur), Hebrew (he) and Persian (fa)
• Users can enable two columns tabs setting in portrait mode.
• Long press on a search suggestion removes it from browser history.

Off-cycle stability update.^[351]

• Fixed a rare condition that could prevent opening restored tabs.
• Fix for accessibility issue with TalkBack.
• Fix for a crash with the Bluhell Firewall add-on.

• Various security fixes.
• The non-standard showDialog argument to window.find is now ignored.
• Right-to-left locales will now display the search bar correctly.
• Prevented video corruption on affected devices.

Desktop

• Made form validation errors and date picker panel visible to the user

Android

• Fix for issues with Android integration.

Off-cycle stability update.^[353]

• Fixed hangs when using a proxy with NTLM authentication.
• Fixed excessive resource usage from the captive portal detection service.
• Bumped preloaded security information expiration times.

End-of-life 53.0.x product line on June 13, 2017.

• Simplified the download button and download status panel.
• Added support for multiple content processes (e10s-multi).
• Added Burmese (my) locale.
• Moved the mobile bookmarks folder to the main bookmarks menu for easier access.
• Added ability to create and save custom devices in Responsive Design Mode.
• Additional changes for web developers.

Android

• Added Bulgarian (bg) and Kabyle (kab) locales.
• Fixed formatting for right-to-left languages, including formatting of preference names in about:config.
• Improved audio and video playback in the browser.
• Improved bookmarks sync performance.

Changes during Developer Edition releases

• Last Developer Edition build that is based on «Aurora» build. Firefox Developer Edition will be based on the «Beta» build afterwards.

• Fix for a display issue of tab title.
• Fix for a display issue of opening new tab.
• Fix for a display issue when opening multiple tabs.
• Fix for a tab display issue when downloading files.

Desktop

• Fix for a PDF printing issue.
• Fix for a Netflix issue on Linux.

Android

• Fix for an inconsistent locale display issue
• Fix for a crash in tabs tray menu
• Fix for issues with navigation

End-of-life 54.0.x product line on August 8, 2017.

• Launched Windows support for WebVR, bringing immersive experiences to the web.
• Added options that let users optimize recent performance improvements
  • Setting to enable Hardware VP9 acceleration on Windows 10 Anniversary Update for better battery life and lower CPU usage while watching videos
  • Setting to modify the number of concurrent content processes for faster page loading and more responsive tab switching
• Simplified installation process with a streamlined Windows stub installer
  • Firefox for Windows 64-bit is now installed by default on 64-bit systems with at least 2GB of RAM
  • Full installers with advanced installation options are still available
• Improved address bar functionality
  • Search with any installed one-click search engine directly from the address bar
  • Search suggestions appear by default
  • When entering a hostname (like pinterest.com) in the URL bar, Firefox resolves to the secure version of the site (https://www.pinterest.com) instead of the insecure version (http://www.pinterest.com) when possible
• Updated Sidebar for bookmarks, history, and synced tabs so it can appear at the right edge of the window as well as the left
• Added support for stereo microphones with WebRTC
• Simplified printing from Reader Mode
• Updated Firefox for OS X and macOS to allow users to assign custom keyboard shortcuts to Firefox menu items via System Preferences
• Browsing sessions with a high number of tabs are now restored in an instant
• Make screenshots of webpages, and save them locally or upload them to the cloud. This feature will undergo A/B testing and will not be visible for some users.
• Added Belarusian (be) locale
• Various security fixes
• Modernized application update UI to be less intrusive and more aligned with the rest of the browser. Only users who have not restarted their browser 8 days after downloading an update or users who opted out of automatic updates will see this change.
• Made the Adobe Flash plugin click-to-activate by default and allowed only on http:// and https:// URL schemes. (This change will not be visible to all users immediately.)
• Firefox does not support downgrades, even though this may have worked in past versions. Users who install Firefox 55+ and later downgrade to an earlier version may experience issues with Firefox.
• Sites that don’t use SSL can no longer access Geolocation APIs to determine a user’s physical location
• Headless mode supported on linux^[356]

Android

• Added actions to manage tabs. You can now reorder tabs by tapping and holding a tab in the tabs tray (or in the tab strip on tablets).
• Added Greek (el) and Lao (lo) locales
• Various security fixes
• Added option to accessibility settings to respect the system’s set font size when displaying web pages
• Video that is not visible will stop rendering to conserve power (audio will still continue)
• Note: Firefox 55 is the last version that supports devices running Android 4.0

Off-cycle stability update.^[357]

• Fix for a rendering issue with some PKCS#11 libraries.
• Fix for a problem causing What’s new pages not to be displayed.
• Fix for a regression in the tab restoration process.
• Disabled the predictor prefetch.

• Fix for a potential issue when the username had some specific characters in the path.
• Fix for an issue with new installation notification for sideload add-ons.
• Fix for performance regressions with WebExtension.
• Fix for a regression with the popup menu.

Android

• Fix for an issue with tab restoration
• Fix for a crash with Telemetry
• Fixed: Blacklisting of Galaxy S4 SPH-L720 model for the adaptive playback feature
• Disabled the predictor prefetch
• Last release to support Android 4.0.x (Ice Cream Sandwich)

Off-cycle stability update.^[360]

• Fixed file uploads to some websites, including YouTube.
• Fix for an issue with addons when using a path containing non-ASCII characters.

End-of-life 55.0.x product line on September 28, 2017.

• Launched Firefox Screenshots, a feature that lets users take, save, and share screenshots without leaving the browser
• Added support for address form autofill (en-US only)
• Updated Preferences
  • Added search tool so users can find a specific setting quickly
  • Reorganized preferences so users can more easily scan settings
  • Rewrote descriptions so users can better understand choices and how they affect browsing
  • Revised data collection choices so they align with updated Privacy Notice and data collection strategy
• Media opened in a background tab will not play until the tab is selected
• Improved Send Tabs feature of Sync for iOS and Android, and Send Tabs can be discovered even by users without a Firefox Account
• Replaced character encoding converters with a new Encoding Standard-compliant implementation written in Rust
• Added hardware acceleration for AES-GCM
• Updated the Safe Browsing protocol to version 4
• Reduced update download file size by approximately 20 percent
• Improved security for verifying update downloads
• Added Layout Panel to CSS Grid DevTools

Android

• Improved support for WebExtensions on Android
• Improved power consumption and performance for WebRTC with the use of hardware encoders
• Added Zapoteco (zam) and Belarusian (be) locales
• Ended support for Flash
• Ended support for devices running Android 4.0

Off-cycle stability update.^[361]

• Blocked D3D11 when using Intel drivers on Windows 7 systems with partial AVX support.
• Users of 32-bit Firefox on 64-bit Windows are migrated to 64-bit Firefox for increased stability and security.

Off-cycle stability update.^[362]

• Disabled Form Autofill completely on user request.
• Fix for video-related crashes on Windows 7.
• Corrected detection for 64-bit GSSAPI authentication.
• Fix for shutdown crash.

End-of-life 56.0.x product line on November 14, 2017.

Firefox 57 («Quantum»)^[363]

• A completely new browsing engine, designed to take full advantage of the processing power in modern devices
• A redesigned interface with optimizations for touch screens
• A unified address and search bar. New installs will see this unified bar
• A revamped new tab page that includes top visited sites, recently visited pages, and recommendations from Pocket (in the US, Canada, and Germany)
• An updated product tour to orient new and returning Firefox users
• AMD VP9 hardware video decoder support for improved video playback with lower power consumption
• An expanded section in preferences to manage all website permissions
• Various security fixes
• Firefox now exclusively supports extensions built using the WebExtension API, and unsupported legacy extensions will no longer work
• The browser’s autoscroll feature, as well as scrolling by keyboard input and touch-dragging of scrollbars, now use asynchronous scrolling. These scrolling methods are now similar to other input methods like mousewheel, and provide a smoother scrolling experience
• The content process now has a stricter security sandbox that blocks filesystem reading and writing on Linux, similar to the protections for Windows and macOS that shipped in Firefox 56
• Middle mouse paste in the content area no longer navigates to URLs by default on Unix systems
• Removed the toolbar Share button
• Some older versions of the ATOK IME, including ATOK 2006, 2008, 2009 and 2010, can cause crashes and are therefore disabled on the Windows 64-bit version of Firefox Quantum
• The default font for Japanese text is now Meiryo
• A complete visual refresh of both the Light and Dark DevTools themes, matching the new visual style of Firefox Quantum
• The Inspector shows the values of CSS variables on hover
• Completely new and re-designed Console panel. Joining the Debugger and the Network Monitor, the Console has been rewritten using modern web technologies such as React and Redux. It now also allows to inspect objects in context.

Android

• Performance improvements for faster page loading and stability
• Updated interface, including a revamped new tab page that includes top visited sites, recently visited pages, and recommendations from Pocket (in the US, Canada and Germany)
• Video decoding is shut down when the tab playing the media is sent to the background. Video resumes when the tab is brought to the foreground. Audio will not be affected
• Added an option to enable tracking protection outside of private browsing
• Automatically enabled private mode on compatible keyboards during private browsing
• Long URLs in the URL bar are now scrollable
• Added Wolof (wo) locale
• Firefox for Android now exclusively supports extensions built using the WebExtension API, and unsupported legacy extensions will no longer work
• Android Apps can now launch Firefox Custom Tabs

• Fix for a video color distortion issue on YouTube and other video sites with some AMD devices.
• Fix for an issue with prefs.js when the profile path has non-ASCII characters.
• Various security fixes.
• Fixed an issue in which Google map crashes on macOS with Intel HD Graphics 3000.
• Blocked injection of a client library associated with the RealPlayer Free player which is known to cause performance problems in Firefox.

Android

• Fixed an issue in which Stop button no longer appears immediately after starting a navigation.
• Various security fixes.

Off-cycle stability update.^[366]

• Blocked old versions of G Data Endpoint Security for crashing Firefox on start up — Windows only
• Fix for a regression with WebGL and D3D9 — Windows only

Off-cycle stability update.^[367]

• Fix for crash reporting issue that inadvertently sends background tab crash reports to Mozilla without a user opt-in.

• Security fixes to address the Meltdown^{[citation needed]} and Spectre timing attacks.

End-of-life 57.0.x product line on January 23, 2018.

• Performance improvements, including:
  • Rendering graphics for Windows users by using Off-Main-Thread Painting (OMTP)
  • Loading pages faster by changing how Firefox caches and retrieves JavaScript
• Improvements to Firefox Screenshots:
  • Copy and paste screenshots directly to your clipboard
  • Firefox Screenshots now works in Private Browsing mode
• Added support for credit card autofill
• Added Nepali (ne-NP) locale
• Users can enable Tracking Protection at all times.
• Fonts installed in non-standard directories will no longer appear blank for Linux users
• Various security fixes
• User profiles created in Firefox 58 (and in future releases) are not supported in previous versions of Firefox. Users who downgrade to a previous version should create a new profile for that version.
• Added a warning to alert users and site owners of planned security changes to sites affected by the gradual distrust plan for the Symantec certificate authority
• Implemented the PerformanceNavigationTiming API
• Added PerformanceResourceTiming.workerStart so sites can measure service worker startup time

Android

• Performance improvements, including:
  • Support for Progressive Web Apps
  • Loading pages faster by changing how Firefox caches and retrieves JavaScript
• Added ability to Sync only over non-metered connections (e.g., WiFi). Setting available via Sync Preferences.
• Added full screen bookmark management with folder support
• Added support for FLAC (Free Lossless Audio Codec) playback
• Added ability to change the status bar color in themes
• Added Bengali from Bangladesh (bn-BD) and Nepali (ne-NP) locales
• Removed the Firefox Search widget from home screen
• Updated the Safe Browsing protocol to version 4

• Security fix.
• Fixed an issue in which, when using certain non-default security policies on Windows (for example with Windows Defender Exploit Protection or Webroot security products), Firefox 58.0 would fail to load pages.

Android

• Fixed performance issue whereby some installations were initially slow to load pages.

• Avoided a signature validation issue during update on macOS
• Blocklisted graphics drivers related to off main thread painting crashes.
• Fixed tab crash during printing.
• Fix for clicking links and scrolling emails on Microsoft Hotmail and Outlook (OWA) webmail.

Android

• Fixed an issue in which, if the user cancels a download by exiting our app chooser dialogue without choosing anything, the download continues invisibly in background.

End-of-life 58.0.x product line on March 13, 2018.

• Performance enhancements:
  • Faster load times for content on the Firefox Home page
  • Faster page load times by loading either from the networked cache or the cache on the user’s hard drive (Race Cache With Network)
  • Improved graphics rendering using Off-Main-Thread Painting (OMTP) for Mac users
• Drag-and-drop to rearrange Top Sites on the Firefox Home page, and customize new windows and tabs in other ways
• Added features for Firefox Screenshots:
  • Basic annotation lets the user draw on and highlight saved screenshots
  • Recropping to change the viewable area of saved screenshots
• Enhanced WebExtensions API including better support for decentralized protocols and the ability to dynamically register content scripts
• Improved Real-Time Communications (RTC) capabilities.
  • Implemented RTP Transceiver to give pages more fine grained control over calls
  • Implemented features to support large scale conferences
• Added support for W3C specs for pointer events and improved platform integration with added device support for mouse, pen, and touch screen pointer input
• Added the Ecosia search engine as an option for German Firefox
• Added the Qwant search engine as an option for French Firefox
• Added settings in about:preferences to stop websites from asking to send notifications or access your device’s camera, microphone, and location, while still allowing trusted websites to use these features
• Various security fixes
• Firefox Private Browsing Mode will remove path information from referrers to prevent cross-site tracking

Android

• Added Firefox as an Assist App so users can start a search by long-pressing the home button
• Added support for HLS (HTTP Live Streaming) playback for improved compatibility with video sites
• Firefox Private Browsing Mode will remove path information from referrers sent to third parties to help prevent third-party data leakage
• The «about:» page was removed
• Locked video full screen in landscape mode

• Various security fixes.

• Fixed invalid page rendering with hardware acceleration enabled
• Fixed an issue in which Windows 7 users with touch screens or certain 3rd party desktop applications which interact with Firefox through accessibility services may experience random browser crashes
• Fixed an issue in which browser keyboard shortcuts (e.g. copy Ctrl+C) don’t work on sites that use those keys with resistFingerprinting enabled
• Fixed high CPU / memory churn caused by third-party software on some computers.
• Fixed an issue in which users who have configured an «automatic proxy configuration URL» and want to reload their proxy settings from the URL will find the Reload button disabled in the Connection Settings dialog when they select Preferences/Options > Network Proxy > Settings
• Fixed an issue in which URL fragment identifiers break Service Worker responses.
• Fixed an issue in which users trying to cancel a print around the time it completed would continue to get intermittent crashes
• Fixed broken getUserMedia (audio) on DragonFly, FreeBSD, NetBSD, OpenBSD. Video chat apps either wouldn’t work or be always muted
• Various security fixes

Android

• Fixed top crasher on Firefox for Android
• Fixed an issue in which URL fragment identifiers break Service Worker responses

Off-cycle stability update.^[378]

• Fix for compatibility with Windows 10 April 2018 update.

End-of-life 59.0.x product line on May 9, 2018.

• Added a policy engine that allows customized Firefox deployments in enterprise environments, using Windows Group Policy or a cross-platform JSON file.
• DNS over HTTPS (DOH) functionality available.
• Enhancements to New Tab / Firefox Home.
  • Responsive layout that shows more content for users with wide-screen displays.
  • Highlights section includes web sites saved to Pocket.
  • More options to reorder sections and content on the page.
  • Pocket Sponsored Stories will appear for a percentage of users in the US.
• Redesigned Cookies and Site Storage section in Preferences for greater clarity and control of first- and third-party cookies.
• Applied Quantum CSS to render browser UI.
• Added support for Web Authentication API, which allows USB tokens for website authentication.
• Enhanced camera privacy indicators: Firefox now turns off your camera and the camera’s light when you disable video recording, and turns the camera and light on when you resume recording.
• Added an option for Linux users to show or hide page titles in a bar at the top of the browser.
• Improved WebRTC audio performance and playback for Linux users.
• Locale added: Occitan (oc).
• Various security fixes.
• Changed the Windows shortcut for entering Reader View to F9, for better compatibility with keyboard layouts that use AltGr.
• Bookmarks no longer support multiple keywords for the same URL unless the request has different POST data.
• TLS certificates issued by Symantec before June 1, 2016, are no longer trusted by Firefox.
• Updated the Skia graphics library to milestone 66.
• Changes affecting developers.

Android

• Implemented Quantum CSS (also known as Stylo) in Android for faster page rendering.
• Added View Page Source option to the Page Action menu.
• Various security fixes.
• Changes affecting developers.

• Avoided overly long cycle collector pauses with some add-ons installed.
• Fixed an issue in which, after unchecking the «Sponsored Stories» option, the New Tab page now immediately stops displaying «Sponsored content» cards.
• On touchscreen devices, fixed momentum scrolling on non-zoomable pages.
• Fixed black map on Google Maps with updated Nvidia Web Drivers on macOS.
• Corrected use of the right default background when opening tabs or windows in high contrast mode.
• The Firefox uninstaller on Windows is now translated again.
• Restored translations of the Preferences panels when using a language pack.
• WebVR has been disabled by default on macOS.

Android

• On touchscreen devices, fixed momentum scrolling on non-zoomable pages.

• Updated to NSS 3.36.4 from 3.36.1:
  • Fixed an issue in which connecting to a server that was recently upgraded to TLS 1.3 would result in a SSL_RX_MALFORMED_SERVER_HELLO error.
  • Fix for a crash on macOS related to authentication tokens, e.g. PK11 or WebAuthn.

Desktop

• Fix for missing nodes in the developer tools Inspector panel.
• Fix for font rendering when using third-party font managers on OS X 10.11 and earlier.
• Various security fixes.

End-of-life 60.0.x product line^{[failed verification – see discussion]} on June 26, 2018.

• Firefox Quantum arrives in the ESR channel. Key features include:
  • A completely new browser engine, designed to take full advantage of the processing power in modern devices
  • A redesigned interface with a clean, modern appearance, consistent visual elements, and optimizations for touch screens
  • A unified address and search bar. New installs will see this unified bar.
  • A revamped new tab page that includes top visited sites, recently visited pages, and recommendations from Pocket (in the US, Canada, and Germany)
  • An updated product tour to orient new and returning Firefox users
• Support for enterprise environments, with a policy engine that allows customized Firefox deployments using Windows Group Policy or a cross-platform JSON file
• Firefox now exclusively supports extensions built using the WebExtension API. Unsupported legacy extensions will no longer work in Firefox 60 ESR, but they will continue to work in Firefox 52 ESR, which will be supported until September 2018.
• DNS over HTTPS (DOH) functionality available.
• TLS certificates issued by Symantec before June 1, 2016, are no longer trusted by Firefox. The «security.pki.distrust_ca_policy» preference can be set to 0 to reinstate trust in those certificates

Same changelog of 60.0.1

Same changelog of 60.0.2

• Various security fixes
• Various stability and regression fixes

• Various security fixes
• Various stability and regression fixes

• Disabled multiprocess support for users running old versions of the JAWS screen reader software
• Fixed a startup crash affecting users migrating from older ESR releases
• Cleaned up old NSS DB files after upgrading
• Various security fixes

• Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc.) are activated
• Various security fixes

• Various stability and regression fixes
• Various security fixes

• Updated list of currency codes to include Unidad Previsional (UYW)
• Various security fixes

• Various security fixes

• Various security fixes

• Fixed a frequent crash when reading various Reuters news articles

• Various security fixes
• In the network connections settings, sites added to the «No proxy for» list will now honor that setting regardless of any other specified proxy settings

• Various security fixes

• Repaired certificate chain to re-enable web extensions that had been disabled

• Further improvements to re-enable web extensions which had been disabled for users with a master password set

• Various security fixes
• Font and date adjustments to accommodate the new Reiwa era in Japan

• Security fix

• Security fix

• Various security fixes.

• Various security fixes.

End-of-life 60.x.x product line^{[failed verification – see discussion]} on October 22, 2019.

• Enhanced performance:
  • Faster page rendering with Quantum CSS improvements and the new retained display list feature
  • Faster switching between tabs on Windows and Linux
  • WebExtensions now run in their own process on MacOS
• Convenient access to more search engines: You can now add search engines to the address bar «Search with» tool from the page action menu when on a webpage that provides an OpenSearch plugin
• Share links from Firefox for MacOS more easily: You can now share the URL of an active tab from the page actions menu in the address bar
• Improved security:
  • On-by-default support for the latest draft of the TLS 1.3 specification
  • Access to FTP subresources inside http(s) pages has been blocked
• A more consistent user experience: Improvements for dark theme support across the entire Firefox user interface
• More customization for tab management: added support to allow WebExtensions to hide tabs
• Improved bookmark syncing
• The settings for customizing your homepage and new tab page in Firefox have been added to a new Preferences section that can be accessed from Firefox at about:preferences#home. The settings can also be accessed via the gear icon on the New Tab page.

Android

• Performance enhancements:
  • Quantum CSS improvements which improve page rendering times
  • Faster scrolling due to treating touch event listeners as passive by default
• Improved security: On-by-default support for the latest draft of the TLS 1.3 specification
• Fixed a recurring crash on Samsung Galaxy S8 devices running Android Oreo (8.0)

Off-cycle stability update.^[420]

• Fixed broken website loading for Chinese users with accessibility enabled.
• Fixed missing content on the New Tab Page and the Home section of the Preferences page.
• Fixed loss of bookmarks under rare circumstances when upgrading from Firefox 60.
• Improved playback of Twitch 1080p video streams.
• Web pages no longer lose focus when a browser popup window is opened.
• Fixed launching of downloads without a file extension on Windows.
• Re-allowed downloading files from FTP sites via the «Save Link As» option when linked from HTTP pages.
• Fixed extensions being unable to override the default homepage in certain situations.

• Adds support for automatically restoring your Firefox session after Windows restarts.
• Improved website rendering with the Retained Display List feature enabled.
• Fixed broken DevTools panels with certain extensions installed.

Desktop

• Fixed a crash for users with some accessibility tools enabled.

Android

• Fixed a crash on devices running Android KitKat 4.4 or earlier.

End-of-life 61.0.x product line^{[failed verification – see discussion]} on September 5, 2018.

• Firefox Home (the default New Tab) now allows users to display up to 4 rows of top sites, Pocket stories, and highlights
• «Reopen in Container» tab menu option appears for users with Containers that lets them choose to reopen a tab in a different container
• In advance of removing all trust for Symantec-issued certificates in Firefox 63, a preference was added that allows users to distrust certificates issued by Symantec
• Added FreeBSD support for WebAuthn
• Improved graphics rendering for Windows users without accelerated hardware using Parallel-Off-Main-Thread Painting
• Support for CSS Shapes, allowing for richer web page layouts. This goes hand in hand with a brand new Shape Path Editor in the CSS inspector
• CSS Variable Fonts (OpenType Font Variations) support, which makes it possible to create beautiful typography with a single font file
• Updates for enterprise environments:
  • AutoConfig is sandboxed to the documented API by default
• Added Canadian English (en-CA) locale
• Removed the description field for bookmarks
• Dark theme is automatically enabled in macOS 10.14 dark mode
• Changed the default setting to Enforce (3) for the security.pki.name_matching_mode preference
• Adobe Flash applets now run in a more secure mode using process sandboxing on macOS
• Users disconnecting from Sync are now offered the option to wipe their Firefox profile data (including bookmarks, passwords, history, cookies, and site data) from their desktop computer
• Changed how WebRTC handles screen sharing: When screen-sharing a window, the window will be brought to front
• Three-pane Inspector in Developer Tools separates the rules into its own panel
• Changes affecting developers

Android

• Improved scrolling performance
• Faster page load times over WiFi connections by loading from the network cache if disk cache is slow
• «Product and feature tips» toggle in Notifications settings, allowing for more control over which notifications are shown
• WebRTC video sessions between Firefox for Android and Safari browsers works again

Off-cycle stability update.^[423]

• Fixed a crash when navigating sites with WebGL content.

• Unvisited bookmarks can once again be autofilled in the address bar.
• Fixed WebGL rendering issues.
• Updates from unpacked language packs no longer break the browser.
• Fixed fallback on startup when a language pack is missing.
• Fixed an issue in which profile refresh from the Windows stub installer restarts the browser.
• Properly restored window size and position when restarting on Windows.
• Avoided crash when sharing a profile with newer (as yet unreleased) versions of Firefox.
• Fixed an issue in which you do not undo removal of search engines when using a language pack.
• Fixed rendering of some web sites.
• Restored compatibility with some sites using deprecated TLS settings.
• Fix for screen share on macOS when using multiple monitors.
• Various security fixes.

Android

• Fixed rendering of some web sites.
• Restored compatibility with some sites using deprecated TLS settings.
• Oversized quick share icons on Android 6.0 and newer.
• Various security fixes.

• Various security fixes.

Desktop

• Fixed hangs on macOS Mojave (10.14) when various dialog windows (upload, download, print, etc.) are activated.
• Fixed playback of some encrypted video streams on macOS.

End-of-life 62.0.x product line^{[failed verification – see discussion]} on October 23, 2018.

• Performance and visual improvements for Windows users
  • Moved the build infrastructure of Firefox on Windows to the Clang toolchain, bringing important performance gains
  • Firefox theme now matches the Windows 10 OS Dark and Light modes
• Performance improvements for macOS users
  • Improved reactivity
  • Faster tab switching
  • WebGL power preferences allow non-performance-critical applications and applets to request the low-power GPU instead of the high-power GPU in multi-GPU systems
• Added content blocking, a collection of Firefox settings that offer users greater control over technology that can track them around the web.
• WebExtensions now run in their own process on Linux
• Firefox now warns about having multiple windows and tabs open when quitting from the main menu
• Firefox now recognizes the operating system accessibility setting for reducing animation
• Added search shortcuts for Top Sites: Amazon and Google appear as Top Sites tiles on the Firefox Home (New Tab) page (U.S. only)
• Resolved an issue that prevented the address bar from autofilling bookmarked URLs in certain cases
• In the Library, the Open in Sidebar feature for individual bookmarks was removed
• The option to Never check for updates was removed from about:preferences
• The Ctrl+Tab shortcut now displays thumbnail previews of your tabs and cycles through tabs in recently used order
• Refreshed visual style of Developer Tools menus to improve navigation and consistency
• The Dev Tools accessibility inspector is now enabled by default
• Added support for Web Components custom elements and shadow DOM
• The inspector now ships with a Font Editor that allows you to control non-variable as well as variable fonts

Android

• Added support for Picture-In-Picture video
• Started using notification channels
• Locales added: English from Canada (en-CA), and Ligurian (lij)
• App now targets Oreo with security and performance improvements and support for new features

Off-cycle stability update.^[428]

• Fixed an issue in which snippets are not loaded due to a missing element.
• Fixed an issue in which print preview always shows 30% scale when it is actually Shrink To Fit.
• Fixed an issue in which dialog displayed when closing multiple windows shows unreplaced %$1S placeholder in Japanese and potentially other locales.

Off-cycle stability update.^[429]

• Fixed an issue in which session history popup breaks after one usage.
• Fixed flickering of (some) sticky elements on Twitter and other websites.
• Fixed a hang in Samsung Galaxy devices.
• Crash fixes.

Off-cycle stability update.^[430]

• Fixed an issue in which games using WebGL (created in Unity) get stuck after very short time of gameplay.
• Fixed slow page loading for some users with specific proxy configurations.
• Disabled HTTP response throttling by default for causing bugs with videos in background tabs.
• Fixed an issue in which opening magnet links no longer works.
• Crash fixes.

End-of-life 63.0.x product line^{[failed verification – see discussion]} on December 11, 2018.

Official Firefox 64.0 release for desktop.^[388]

• Better recommendations: You may see suggestions in regular browsing mode for new and relevant Firefox features, services, and extensions based on how you use the web (for US users only).
• Enhanced tab management: You can now select multiple tabs from the tab bar and close, move, bookmark, or pin them quickly and easily.
• Easier performance management: The new Task Manager page found at about:performance lets you see how much energy each open tab consumes and provides access to close tabs to conserve power.
• Improved performance for Mac and Linux users, by enabling link time optimization (Clang LTO).
• More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience.
• Added option to remove add-ons using the context menu on their toolbar buttons.
• Updated the policy engine on macOS to allow using configuration profiles to customize Firefox for enterprise deployments.
• Various security fixes.
• RSS feed preview and live bookmarks are available only via add-ons.
• TLS certificates issued by Symantec are no longer trusted by Firefox.
• about:crashes has been redesigned to make it clear when a crash is being submitted to Mozilla, as well as being clear that removing crashes locally does not remove them from crash-stats.mozilla.com.
• The macOS keyboard shortcut to add «www» and «.com» to a URL is now ctrl-enter instead of [apple]-enter.
• You may now overlay multiple CSS grids at the same time (up to 3) in the CSS Grid Inspector.
• The Web Console’s command line now highlights JavaScript syntax.
• When hovering over elements in the Accessibility panel, the contrast ratio of text against background is now indicated.
• Added support for the new CSS scrollbar specification.
• WebVR is now available on macOS.

Official Firefox 64.0 release for Android.^[389]

• Scrolling is faster and more responsive.
• Files downloaded after this update are no longer deleted when uninstalling Firefox.
• Fixed performance lags for users with installed password manager apps.
• Fixed an issue that resulted in the loading indicator using too much CPU and power.
• Various security fixes.
• TLS certificates issued by Symantec are no longer trusted by Firefox.

• Fixed video stuttering on YouTube.
• Properly restored column sizes in developer tools inspector.
• Fix for updates for some lightweight themes.

Desktop

• Fixed a browser crash on macOS.
• Updated the Japanese translation for missing strings.

Android

• Fixed a crash when Firefox for Android is put in background.
• Fixed a crash when using Web Speech.

End-of-life 64.0.x product line^{[failed verification – see discussion]} on January 29, 2019.

• Enhanced tracking protection: Simplified content blocking settings give users standard, strict, and custom options to control online trackers.
• Updated Language section in Preferences
• Support for Handoff on macOS
• A better video streaming experience for Windows users: Firefox now supports the next-generation, royalty-free video compression technology called AV1.
• Improved performance and web compatibility, with support for the WebP image format
• Various security fixes.
• Enhanced security for macOS, Linux, and Android users via stronger stack smashing protection which is now enabled by default for all platforms.
• Firefox will now warn you when closing a window (regardless of whether you have automatic session restore enabled for restart).
• Revamped Task Manager page found at about:performance
• Improved the pop-up blocker to prevent multiple pop-up windows from being opened by websites at the same time.
• Firefox for Windows is now available with 32- and 64-bit MSI installers for easier enterprise deployments.
• Launched a new Flexbox inspector tool that details Flexbox containers and helps debug Flex item sizes
• All CSS changes made in the Rules panel are now tracked in the new Changes tab.
• Added support for the Storage Access API on desktop platforms.

Android

• Improved performance: Scrolling is faster and more responsive
• Improved performance and web compatibility, with support for the WebP image format
• Restored Chromecast controls to the location bar.

• Fixed accidental requests to addons.mozilla.org when an addon recommendation doorhanger is shown.
• Improved playback of interactive Netflix videos.
• Fixed color management not working on macOS.
• Fixed incorrect sizing of the «Clear Recent History» window in some situations.
• Fixed looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server.
• Fixed the «Enter» key not working on password entry fields for certain Linux distributions.
• Various stability and security fixes.
• Made support for <meta> viewport tags in Responsive Design Mode, initially enabled in Firefox 64, pref-controlled and off by default.
• Fixed looping CONNECT requests when using WebSockets over HTTP/2 from behind a proxy server.

Desktop

• Fixed audio & video delays while making WebRTC calls.
• Fixed video sizing problems during some WebRTC calls.

Android

• Various stability and security fixes.

Off-cycle stability update.^[435]

• Fixed an issue with geolocation services affecting Windows users

End-of-life 65.0.x product line^{[failed verification – see discussion]} on March 19, 2019.

• Firefox now prevents websites from automatically playing sound
• Improved search experience:
  • Find a specific webpage faster when you have a lot of tabs open
  • Easier search via a redesigned new tab in Private Windows
• Smoother scrolling: Scroll anchoring keeps content from jumping as images and ads load at the top of a page
• Improved performance and better user experience for extensions:
  • Extensions now store their settings in a Firefox database, rather than individual JSON files, making every site you visit faster
  • A redesigned keyboard shortcuts section in about:addons makes it easier to view and adjust default shortcuts
• Redesigned certificate error pages help you better understand and resolve issues, including identification of certificate issuers for anti-virus software
• Added basic support for macOS Touch Bar
• Experimenting with an improved Pocket experience in New Tab with different layouts and more topical content
• Improved performance and reduced crash rates by doubling web content loading processes from 4 to 8
• Easier, passwordless security: Added support for Windows Hello on Windows 10
• Enabled AV1 support on 32-bit Windows and MacOS
• The Dark and Light Firefox themes now override the system setting for title bar accent color on Windows 10
• Linux users: Resolved an issue that caused Firefox to freeze when downloading files
• Various security fixes
• System title bar is hidden by default to match Gnome guideline for Linux users
• DevTools Inspector is now fully usable when the Debugger is paused
• Lowered priority of setTimeout and setInterval during page load to improve overall page load performance
• Fixed: <button> element is no longer special cased in event dispatch, per latest specifications

Android

• Added support to open files from external storage, such as an SD card

• Various security fixes.

Desktop

• Fixed Web compatibility issues with Office 365, iCloud and IBM WebMail caused by recent changes to the handling of keyboard events.
• Crash fixes.

Android

• Fixed frequent crashes on sites using the OpenH264 video codec for WebRTC.

Off-cycle stability update.^[440]

• Address bar on tablets running Windows 10 now behaves correctly.
• Fixed performance issues with some HTML5 games.
• Fixed a bug with keypress events in IBM cloud applications.
• Fix for keypress events in some Microsoft cloud applications.
• Updated Baidu search plugin.

• Repaired certificate chain to re-enable web extensions that had been disabled

• Further improvements to re-enable web extensions which had been disabled for users with a master password set

End-of-life 66.0.x product line^{[failed verification – see discussion]} on May 21, 2019.

Desktop

• Firefox 67 demonstrates improved performance thanks to a number of changes such as:
  • Lowering priority of setTimeout during page load
  • Delayed component initialization until after start up
  • Painting sooner during page load but less often
  • Suspending unused tabs
• Users can block known cryptominers and fingerprinters in the Custom settings of their Content Blocking preferences
• Keyboard accessibility has improved in the latest version of Firefox
• Private Browsing sees both usability and security improvements:
  • Save passwords in private browsing mode
  • Choose which extensions to exclude from private tabs
• A myriad of new features help make Firefox easier to use:
  • Added toolbar for Firefox Account to provide more transparency for when you are synced, sharing data across devices and with Firefox
  • Tabs can now be pinned from the Page Actions menu in the address bar
  • Firefox will highlight useful features (like Pin Tabs) when users are most likely to benefit from them
  • Easier access to your list of saved logins from the main menu and login autocomplete
  • The Import Data from Another Browser feature is now also available from the File menu
  • Users will be able to run different Firefox installs side by side by default so that you can run the beta and release versions simultaneously
• Protection against running older versions of the browser which can lead to data corruption and stability issues
• Firefox is upgrading to the newer, higher performance, AV1 decoder known as ‘dav1d’
• WebRender is gradually enabled by default on Windows 10 desktops with NVIDIA graphics cards
• Mozilla’s highest performing JavaScript compiler now supports ARM64 Windows devices
• Enabling FIDO U2F API and permitting registrations for Google Accounts
• Improved Pocket experience Firefox Home with different layouts and more topical content
• Various security fixes
• Firefox no longer supports handling webcal: links with 30boxes.com
• Changes to extensions in Private Windows
• Users will no longer be able to upload and share screenshots through the Firefox Screenshots server
• Included Twemoji Mozilla font updated to support Emoji 11.0 🥳
• Font and date adjustments to accommodate the new Reiwa era in Japan
• The DevTools Changes panel now supports copying modified CSS
• JavaScript module imports — Firefox now supports dynamic module imports
• New streamlined worker debugging in the JavaScript Debugger with the new Threads panel
• New inline breakpoints provided by the JavaScript Debugger give a much higher fidelity and reliability for pausing in specific locations within a line of code

Android

• A new Firefox Search widget with voice input can be added to the Android home screen from the Android Widget section
• Various security fixes
• The Guest Session feature has been removed to streamline user experience
• CSS Viewport-compat — Firefox for Android’s mobile viewport behavior is now aligned with other browsers, resolving known compatibility issues with websites

Off-cycle stability update.^[445]

• A new experience that includes a set of web pages and in-browser notifications
  • With the new experience, there will be an opportunity for users to opt in for test-driving upcoming products during registration
• Enhanced Tracking Protection (ETP), stronger privacy protections on by default as «Standard» in the Privacy & Security setting
  • Ability to turn ETP on
• A number of products and services
  • Facebook Container version 2.0
  • Firefox Lockwise (formerly Lockbox), with its new name, look and feel, is now fully cross-platform with the introduction of the Lockwise desktop extension in this release
  • Firefox Monitor 2.0 expands its capabilities to allow users with a Firefox account to monitor multiple email addresses and receive email alerts when any of them are involved in a known breach
  • Firefox Send allows you to send files up to 1GB with end-to-end encryption and a link that automatically expires

• Fix for JavaScript error («TypeError: data is null in PrivacyFilter.jsm») in console which may significantly degrade sessionstore reliability and performance
• Fixed an issue in which proxy authentication dialog box repeatedly pops up asking to authenticate after upgrading to Firefox 67
• Fixed an issue in which Pearson MyCloud breaks if FIDO U2F is not Chrome’s implementation
• Fixed performance-regression for eclipse RAP based applications
• Fixed an issue in which you can’t start two downloads in parallel via a download anymore

Desktop

• Fixed an issue in which starting in safe mode on Linux or macOS causes Firefox to think on the subsequent launch that the profile is too recent to be used with this version of Firefox
• Fixed an issue in which Linux distribution users can’t easily install/use additional/different languages using the built-in preferences UI
• Fixed an issue in which developer tools users can’t copy the href/src content from various HTML tags via the context menu in the Inspector markup view
• Fixed an issue in which custom home page is broken with clearing data on shutdown settings applied
• Crash fix for macOS 10.15

• Security fix

Off-cycle security update.^[450]

• Security fix

End-of-life 67.0.x product line^{[failed verification – see discussion]} on July 9, 2019.

Desktop

• Dark mode in reader view expands so that windows are also dark on the controls, sidebars and toolbars
• Improved extension security and discovery:
  • New reporting feature in about:addons allows you to report security and performance issues with extensions and themes
  • Redesigned extensions dashboard in about:addons provides easy access to information about your extensions, including data and settings access required by each extension
  • Find high quality, secure extensions via the Recommended Extensions program in about:addons, which now displays user count and ratings for each extension
• Cryptomining and fingerprinting protections are added to strict content blocking settings in Privacy & Security preferences
• WebRender will roll out to Windows 10 users with AMD graphics cards
• Windows Background Intelligent Transfer Service (BITS) update download support, which allows Firefox update downloads to continue when Firefox is closed
• Various security fixes
• Fixed: Local files can no longer access other files in the same directory
• Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization
• The following unmaintained translations have been removed: Assamese (as), English — South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or)
• When an HTTPS error caused by antivirus software is detected, Firefox will attempt to automatically fix it
• Camera and microphone access now require an HTTPS connection
• The way non-default preferences are synced has changed
• For all operating systems, we have a number of additional policies including:
  • New tab page configuration and disabling
  • Local file links
  • Download behavior
  • Search suggestions
  • Managed storage for using policies in Webextensions
  • Extension whitelisting and blacklisting by ID and website
  • A subset of commonly used Firefox preferences
• Firefox Developer Tools now offers a full page color contrast audit that identifies all elements on a page that fail color contrast checks
• Added about:compat, where website-specific workarounds are listed and may be toggled
• Introduction of CSS Scroll Snap module that enforces scroll snap positions

Android

• Improved web page painting performance by avoiding redundant calculations during paint
• WebAuthn (the Web Authentication API) allows users to sign in to a website with a hardware token or even a fingerprint, enabling password-free authentication
• Various security fixes
• Fixed: Local files can no longer access other files in the same directory
• Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization
• The following unmaintained translations have been removed: Assamese (as), English — South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or)
• New installations of Firefox for Android will no longer automatically download the Cisco OpenH264 plugin for WebRTC
• Added about:compat, where website-specific workarounds are listed and may be toggled

Desktop

• macOS releases are now signed by the Apple notary service, allowing Firefox to properly run on macOS 10.15 Beta releases
• Fixed missing Full Screen button when watching videos in full screen mode on HBO GO
• Fixed a bug causing incorrect messages to appear for some locales when sites try to request the use of the Storage Access API
• Fixed an issue in which users in Russian regions may have their default search engine changed
• Fixed an issue in which built-in search engines in some locales do not function correctly

Desktop

• Fixed a bug causing some special characters to be cut off from the end of the search terms when searching from the URL bar
• Allowed fonts to be loaded via file:// URLs when opening a page locally
• Printing emails from the Outlook web app no longer prints only the header and footer
• Fixed a bug causing some images not to be displayed on reload, including on Google Maps
• Fixed an error when starting external applications configured as URI handlers
• Security fixes

Android

• Allowed fonts to be loaded via file:// URLs when opening a page locally

End-of-life 68.0.x product line^{[failed verification – see discussion]} on September 3, 2019.

Android

• Firefox for Android v68.1 introduces on-by-default Enhanced Tracking Protection
• Various security fixes

Android

• Turned on ability to deliver in-app messages via Leanplum for 64-bit builds

Android

• Ability to sign in to a Firefox account from the onboarding experience as well as from the new tab page
• Resolved crash in «Welcome» screen
• Various security fixes

Android

• Updated to the latest Firefox branding
• Added new locales to the updated onboarding experience previously released in Firefox for Android 68.2.0

Android

• Updates to improve performance and stability
• Various security fixes

Android

• Various security fixes

Android

• Security fix

Android

• Minor fixes

Android

• Updated messaging card on the homescreen to inform users about upcoming releases
• Various stability and security fixes

Android

• Various stability and security fixes

Android

• Various stability and security fixes

Android

• Various stability and security fixes

Android

• Minor bug fixes

Android

• Various stability and security fixes

Android

• Various stability and security fixes

Android

• Fixed a critical security bug

Android

• Various stability and security fixes

• A number of features improve the browser experience in enterprise settings
  • MSI installer file type is included in this release, helping make deployments in the Windows environment easier and more flexible
  • Configuration profiles in macOS
  • The ability to read added certificates roots from the macOS Keychain
• For all operating systems, we have a number of additional policies including:
  • New tab page configuration and disabling
  • Local file links
  • Download behavior
  • Search suggestions
  • Managed storage for using policies in Webextensions
  • Extension configuration (allow/deny) by ID and website
  • A subset of commonly used Firefox preferences
• Fixed: Local files can no longer access other files in the same directory
• Added support for the event property on the Window object to improve web compatibility for enterprises.

• macOS releases are now signed by the Apple notary service, allowing Firefox to properly run on macOS 10.15 Beta releases
• Fixed missing Full Screen button when watching videos in full screen mode on HBO GO
• Fixed a bug causing incorrect messages to appear for some locales when sites try to request the use of the Storage Access API
• Fixed an issue in which users in Russian regions may have their default search engine changed
• Fixed an issue in which built-in search engines in some locales do not function correctly
• Enterprise Policy improvements:
  • Fixed an issue in which SupportMenu policy doesn’t always work
  • Allowed the new ExtensionSettings policy to work with GPO on Windows
  • Allowed the privacy.file_unique_origin pref to be controlled by policy

• Fixed a bug causing some special characters to be cut off from the end of the search terms when searching from the URL bar
• Allowed fonts to be loaded via file:// URLs when opening a page locally
• Printing emails from the Outlook web app no longer prints only the header and footer
• Fixed a bug causing some images not to be displayed on reload, including on Google Maps
• Fixed an error when starting external applications configured as URI handlers
• Security fixes

• Various security fixes
• Various stability and functionality fixes

• Various security fixes
• New administrative policies were added

• Updates to improve performance and stability
• Various security fixes

• Various security fixes

• Security fix

• Fixed various issues opening files with spaces in their path

• Various security and stability fixes

• Various security and stability fixes

• Security fixes

• Various security and stability fixes

• Various security and stability fixes

• Various security and stability fixes

• Various security and stability fixes

• Various security and stability fixes

• Various security fixes

End-of-life 68.x.x product line^{[failed verification – see discussion]} on September 22, 2020.

Desktop

• Enhanced Tracking Protection (ETP) rolls out stronger privacy protections:
  • The default standard setting for this feature now blocks third-party tracking cookies and cryptominers
  • The optional strict setting blocks fingerprinters as well as the items blocked in the standard setting
• The Block Autoplay feature is enhanced to give users the option to block any video that automatically starts playing, not just those that automatically play with sound
• A new «New Tab» page experience that connects US users or those using the en-US browser to the best of Pocket’s content
• Support for the Web Authentication HmacSecret extension via Windows Hello for versions of Windows 10 May 2019 or newer
• Support for receiving multiple video codecs with this release makes it easier for WebRTC conferencing services to mix video from different clients
• Users on Windows 10 will see performance and UI improvements:
  • Firefox will give Windows hints to appropriately set content process priority levels
  • Existing Windows 10 users can easily find and launch Firefox from a shortcut on the Win10 taskbar
• For users on macOS, battery life and download UI are both improved:
  • macOS users on dual-graphics-card machines (like MacBook Pro) will switch back to the low-power GPU more aggressively, saving battery life
  • Finder on macOS now displays download progress for files being downloaded
• JIT support comes to ARM64 for improved performance of our JavaScript Optimizing JIT compiler
• Various security fixes
• The «Always Activate» option for Flash plugin content has been removed
• No longer a need to identify users on 32-bit version of the Firefox browser on 64-bit version operating systems reducing user agent fingerprinting factors providing greater level of privacy to our users as well as improving the experience of downloading other apps
• Firefox no longer loads userChrome.css or userContent.css by default improving start-up performance
• For Enterprise system administrators that manage macOS computers, we begin shipping a Mozilla signed PKG installer to simplify your deployments
• For our mobile web developers, we have migrated remote debugging from the old WebIDE into a re-designed about:debugging, making debugging GeckoView on remote devices via USB rock solid
• The network panel will now show blocked resources to allow developers to best understand the impact of content blocking and ad blocking extensions
• The new event listener breakpoint feature allows developers to pause on a host of different event types
• Firefox Developer Tools now offers an audit for the presence of text alternatives for non-text content, the a11y panel checks toolbar has been augmented to better help developers adhere to WCAG Guideline 1.1

Desktop

• Fixed external programs launching in the background when clicking a link from inside Firefox to launch them
• Usability improvements to the Add-ons Manager for users with screen readers
• Fixed the Captive Portal notification bar not being dismissable in some situations after login is complete
• Fixed the maximum size of fonts in Reader Mode when zoomed
• Fixed missing stacks in the Developer Tools Performance section
• Security and stability fixes

Desktop

• Fixed a crash when editing files on Office 365 websites
• Fixed detection of the Windows 10 Parental Controls feature being enabled
• Fixed a Linux-only crash when changing the playback speed while watching YouTube videos

Desktop

• Fixed download errors for Windows 10 users with Parental Controls enabled
• Fixed Yahoo mail users being prompted to download files when clicking on emails

End-of-life 69.0.x product line^{[failed verification – see discussion]} on October 22, 2019.

Desktop

• More privacy protections from Enhanced Tracking Protection:
  • Social tracking protection, which blocks cross-site tracking cookies from sites like Facebook, Twitter, and LinkedIn, is now a standard feature of Enhanced Tracking Protection
  • The Privacy Protections report shows an overview, with details, of the trackers Firefox has blocked
• More security protections from Firefox Lockwise, our digital identity and password management tool:
  • Lockwise for desktop lets you create, update, and delete your logins and passwords to sync across all your devices
  • Integrated breach alerts from Firefox Monitor
  • Complex password generation
• Improvements to core engine components, for better browsing on more sites
  • A faster Javascript Baseline Interpreter to handle the modern web’s large codebases and improve page load performance by as much as 8 percent
  • WebRender rolled out to more Firefox for Windows users, now available by default on Windows desktops with integrated Intel graphics cards and resolution of 1920×1200 or less
  • Compositor improvements in Firefox for macOS
• More browser features to help you get the most out of Firefox products and services
  • A stand-alone Firefox account menu for easy access to Firefox services like Monitor and Send
  • A message panel accessed from the gift icon in the toolbar that offers a quick overview of new releases and key features
  • When a website uses your geolocation, an indicator is shown in the address bar
• Various security fixes
• Built-in Firefox pages now follow the system dark mode preference
• Aliased theme properties have been removed, which may affect some themes
• Passwords can now be imported from Chrome on macOS in addition to existing support for Windows
• Readability is now greatly improved on under- or overlined texts, including links
• The Developer Tools Accessibility panel now includes an audit for keyboard accessibility and a color deficiency simulator for systems with WebRender enabled
• The Inspector now grays out CSS declarations that don’t affect the selected element and shows a tooltip explaining why–and even how to fix it
• The new DOM Mutation Breakpoints in Developer Tools allows developers to diagnose when scripts add, remove or update page content
• WebExtensions developers can now inspect browser.storage.local data using the «Addon Debugging» Firefox Developer Tools
• New network resource search in Developer Tools

Desktop

• Fix for an issue that caused some websites or page elements using dynamic JavaScript to fail to load
• Updated OpenH264 video plugin for macOS 10.15 users
• Fix for an issue in which title bar no longer shows in full screen view
• OpenH264 video codec version bump for macOS 10.15 users

End-of-life 70.0.x product line^{[failed verification – see discussion]} on December 3, 2019.

Desktop

• Improvements to Lockwise, our integrated password manager
  • Firefox now recognizes subdomains and will autofill domain logins from Lockwise
  • Integrated breach alerts from Firefox Monitor are now available to users with screen readers
• More information about Enhanced Tracking Protection in action
  • Notifications when Firefox blocks cryptominers
  • A running tally of blocked trackers in the protection panel accessed by clicking the address bar shield
• Picture-in-picture video comes to Firefox for Windows
• Native MP3 decoding on Windows, Linux, and macOS
• Various security fixes
• Configuration page (about:config) reimplemented in HTML
• Firefox will now ship with Catalan (Valencian) (ca-valencia), Tagalog (tl), and Triqui (trs)
• New kiosk mode functionality, which allows maximum screen space for customer-facing displays
• Added support for developers, including:
  • DevTools’ Network panel can now inspect WebSocket messages and automatically formats a variety of framework formats
  • Console’s new multi-line editor mode provides an IDE-like experience that makes it convenient to iterate on longer code snippets
  • The Network panel’s new resource blocking can simulate the impact of tracking protection, security, service outages, and bad connectivity for more robust testing
  • More features and improvements can be found every release in DevTools’ «What’s New» panel in en-US
• New videos every week on the Mozilla Developer YouTube channel
• Improvements to the website certificate viewer, with more features and more detailed information
• Improvements to the extensions downloads API for handling download failures
• Extension popup windows now include the extension name instead of its moz-extension:// url when using the windows.create API
• Extension-registered devtools panels now interact better with screen readers

End-of-life 71.0.x product line^{[failed verification – see discussion]} on January 7, 2020.

Desktop

• Firefox’s Enhanced Tracking Protection now blocks fingerprinting scripts by default for all users
• Firefox replaces annoying notification request pop-ups with a more delightful experience, by default for all users
• Picture-in-picture video is now also available in Firefox for Mac and Linux
• Various security fixes
• Support for blocking images from individual domains has been removed from Firefox, because of low usage and poor user experience
• Experimental support for using client certificates from the OS certificate store can be enabled by setting the preference security.osclientcerts.autoload to true (Windows only)
• Debugger Watchpoints let developers observe object property access and writes for easier to track data flow through an application
• Firefox now supports simulation of meta viewport in Responsive Design Mode

Desktop

• Security fix

Desktop

• Various stability fixes
• Fixed issues opening files with spaces in their path
• Fixed a hang opening about:logins when a master password is set
• Fixed a web compatibility issue with CSS Shadow Parts which shipped in Firefox 72
• Fixed inconsistent playback performance for fullscreen 1080p videos on some systems

End-of-life 72.0.x product line^{[failed verification – see discussion]} on February 11, 2020.

Desktop

• Today’s Firefox release includes two features that help users view and read website content more easily, quickly
  • Page zoom feature for more than a decade that allows users to set the zoom level on a per-site basis; available in about:preferences under «Language and Appearance»
  • A «readability backplate» solution which places a block of background color between the text and background image for websites in High Contrast Mode
• Various security fixes
• Improved audio quality when playing back audio at a faster or slower speed
• A prompt to save logins if a field in a login form was modified
• WebRender will roll out to laptops with Nvidia graphics cards with drivers newer than 432.00, and screen sizes smaller than 1920×1200
• WAMP-formatted WebSocket messages (JSON, MsgPack and CBOR) are now nicely decoded for inspection in the Network panel
• Improved auto-detection of legacy text encodings on old web pages which don’t explicitly declare the text encoding

Desktop

• Fixed crashes on Windows systems running third-party security software such as 0patch or G DATA
• Fixed loss of browser functionality in certain circumstances such as running in Windows compatibility mode or having custom anti-exploit settings
• Resolved problems connecting to the RBC Royal Bank website
• Fixed Firefox unexpectedly exiting when leaving Print Preview mode
• Fixed crashes when playing encrypted content on some Linux systems

End-of-life 73.0.x product line^{[failed verification – see discussion]} on March 10, 2020.

Desktop

• Login management has improved with the ability to reverse alpha sort (Name Z-A) in Lockwise, accessed under Logins and Passwords
• Simple importing of bookmarks and history from Microsoft Edge on Windows and Mac
• Add-ons installed by external applications can now be removed using the Add-ons Manager (about:addons)
• Addition of Facebook Container
• Support for mDNS ICE
• Various security fixes
• Fixed issues involving pinned tabs such as being lost
• Picture-in-Picture toggle is now moved allowing you to flip through to the next image of the batch
• On Windows, Ctrl+I can now be used to open the Page Info window instead of opening the Bookmarks sidebar
• Disabling TLS 1.0 and 1.1 for improvement of website connections (later re-enabled^[466])
• Firefox’s Debugger added support for debugging Nested Web Workers, so their execution can be paused and stepped through with breakpoints
• Support for the new JavaScript optional chaining operator and CSS text-underline-position

Desktop

• Security fixes

End-of-life 74.0.x product line^{[failed verification – see discussion]} on April 7, 2020.

• A number of improvements with Firefox’s revamped address bar:
  • Focused, clean search experience that’s optimized for smaller laptop screens
  • Top sites now appear when address is selected
  • Improved readability of search suggestions with a focus on new search terms
  • Suggestions include solutions to common Firefox issues
  • On Linux, the behavior when clicking on the Address Bar and the Search Bar now matches other desktop platforms
• Firefox will locally cache all trusted Web PKI Certificate Authority certificates known to Mozilla
• Firefox is now available in Flatpak, an easier way to install and use Firefox on Linux
• Direct Composition is being integrated for users on Windows to help improve performance and enable the ongoing work to ship WebRender on Windows 10 laptops with Intel graphics cards
• Various security fixes
• Experimental support for using client certificates from the OS certificate store can be enabled on macOS by setting the preference security.osclientcerts.autoload to true
• Enterprise policies may be used to exclude domains from being resolved via TRR (Trusted Recursive Resolver) using DNS over HTTPS
• The ability to save bandwidth and reduce browser memory by using the loading attribute on the <img> element
• Instant evaluation for Console expressions lets developers identify and fix errors more rapidly than before

End-of-life 75.0.x product line^{[failed verification – see discussion]} on May 5, 2020.

• Strengthened protections for online account logins and passwords, with innovative approaches to managing accounts during this critical time:
  • Firefox displays critical alerts in the Lockwise password manager when a website is breached
  • Prompt to update passwords if one account is involved in a website breach and the same password is used on other websites; a key icon identifies which accounts use that vulnerable password
  • Automatic generation of secure, complex passwords for new accounts across more of the web that are easily saved right in the browser
  • Prevention of casual snooping is device happens to be shared among family or roommates
• Allowing multitasking in Picture-in-Picture
• Support for Audio Worklets that will allow more complex audio processing like VR and gaming on the web
  • Joining Zoom calls on Firefox without the need for any additional downloads
• WebRender continues its roll out to more Firefox for Windows users, now available by default on modern Intel laptops with a small screen (1920×1200) for improved graphics rendering
• Various security fixes
• Two updates to the address bar improving its usability and visibility:
  • The shadow around the address bar field is reduced in width when a new tab is opened
  • The bookmarks toolbar has expanded slightly in size to improve its surface area for touchscreens
• Testing mobile interactions using DevTools’ Responsive Design Mode now mimics the device behavior for handling double-tap to zoom
• Double-clicking table headers in DevTools’ network request table now resizes the column width to fit the content, making it easier to expand the important data
• WebSocket inspection now supports ActionCable message preview, adding to the list of automatically formatted protocols like socket.io, SignalR, WAMP, etc.

Desktop

• Fixed a bug causing some add-ons such as Amazon Assistant to see multiple onConnect events, impairing functionality
• Fixed a crash on 32-bit Windows systems with some nVidia drivers installed

End-of-life 76.0.x product line^{[failed verification – see discussion]} on June 2, 2020.

Desktop

• Pocket recommendations, featuring some of the best stories on the web, will appear on the Firefox new tab for users in the UK
• WebRender continues its roll out to more Firefox for Windows users, now available by default on Windows 10 laptops running on Nvidia GPUs with medium (<= 3440×1440) and large screens (> 3440×1440)
• Ability to view and manage web certificates more easily on the new about:certificate page
• Various security fixes
• A number of features have been fixed to improve Firefox accessibility
  • The applications list in Firefox Options is now accessible to screen reader users
  • Fixed an issue in which some live regions didn’t report updated text with the JAWS screen reader
  • Date/time inputs are now no longer missing labels for users of accessibility tools
• The browser.urlbar.oneOffSearches preference has been removed
• Significant improvements to JavaScript debugging make loading and stepping through sources faster and with less memory being used over time
• Added support for the JavaScript API String.prototype.replaceAll() which allows developers to return a new string with all matches to the provided pattern while preserving the original string

Desktop

• Disabled automatic selection of DNS over HTTPS providers during a test to enable wider deployment in a more controlled way

End-of-life 77.0.x product line^{[failed verification – see discussion]} on June 30, 2020.

Desktop

• The Protections Dashboard includes consolidated reports about tracking protection, data breaches, and password management
• Refresh button added to the Uninstaller
• Screen saver will no longer interrupt WebRTC calls on Firefox, making conference and video calling in Firefox better
• WebRender rolled out to Windows users with Intel GPUs
• Pocket recommendations, featuring some of the best stories on the web, will now appear on the Firefox new tab for 100% of users in the UK
• Various security fixes
• Fixed bugs in the search results quality composition and improved search result texts based on recommendations by partners
• Firefox now requires GNU libc 2.17, libstdc++ 4.8.1 and GTK+ 3.14 or newer versions on Linux
• All remaining DHE-based TLS ciphersuites disabled by default
  • Two more AES-GCM SHA2-based ciphersuites enabled
• TLS 1.0 and 1.1 disabled
• Context menu lets you undo multiple tab closings with a single click and places Close Tabs to the Right and Close Other Tabs in a submenu
• A number of accessibility improvements have been made with this release:
  • When using the JAWS screen reader, pressing the down arrow in an HTML input control with a datalist no longer incorrectly moves the cursor to the next element after the input control
  • Screen readers no longer severely lag or freeze when focusing the microphone/camera/screen sharing indicator
  • Large tables with thousands of rows now load much faster for screen reader users
  • Text input controls with custom styling now correctly show the focus outline when appropriate
  • Screen readers no longer sometimes incorrectly switch to document browsing mode unexpectedly when the user enters the main Developer Tools window
  • Number of animations such as tab hover, search bar expansion, and others reduced for users with migraines and epilepsy
• Enabled support for client certificates stored on macOS and Windows by setting the experimental preference security.osclientcerts.autoload to true
• New policies allow you to configure application handlers, disable picture in picture, and require a master password, which will be renamed to ‘primary password’ in future releases
• DevTools Console now logs uncaught promise errors with much more detailed names, stacks, and properties, particularly improving JavaScript framework debugging
• Debugger’s automatic mapping for minified variable names now also works for Logpoints
• Firefox DevTools’ Network panel now highlights which extension or CORS restriction blocked a request
• New RegExp engine in SpiderMonkey, adding support for the dotAll flag, Unicode escape sequences, lookbehind references, and named captures
• Migrated Firefox users on OS X 10.9-10.11 operating systems to the extended support release (ESR) version of Firefox.

Desktop

• Fixed an issue which could cause installed search engines to not be visible when upgrading from a previous release

Desktop

• Security fix
• Fixed an accessibility regression in reader mode
• Made the address bar more resilient to data corruption in the user profile
• Fixed a regression opening certain external applications

End-of-life 78.0.x product line^{[failed verification – see discussion]} on July 28, 2020.

• Some of the highlights of the new Extended Support Release are:
  • Kiosk mode
  • Client certificates
  • Service Worker and Push APIs are now enabled
  • The Block Autoplay feature is enabled
  • Picture-in-picture support
  • Viewing and managing web certificates in about:certificate

• Fixed an issue which could cause installed search engines to not be visible when upgrading from a previous release

• Security fix
• Fixed an accessibility regression in reader mode
• Made the address bar more resilient to data corruption in the user profile
• Fixed a regression opening certain external applications

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Fixed legacy preferences not being properly applied when set via GPO

• Various stability, functionality, and security fixes

• Security fix

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Security fix
• Fixed a crash during video playback on Apple silicon devices

• Various stability, functionality, and security fixes

• Security fix
• Prevention of access to NTFS special paths that could lead to filesystem corruption

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Resolved an issue caused by a recent Widevine plugin update which prevented some purchased video content from playing correctly
• Security fix

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

• Various stability, functionality, and security fixes

End-of-life 78.x.x product line^{[failed verification – see discussion]} on November 2, 2021.

Desktop

• New WebRender rolled out to Windows users with Intel and AMD GPUs
• Firefox users in Germany will now see more Pocket recommendations in their new tab featuring some of the best stories on the web
• Various security fixes
• Several crashes while using a screen reader were fixed, including a frequently encountered crash when using the JAWS screen reader
• Firefox Developer Tools received significant fixes allowing screen reader users to benefit from some of the tools that were previously inaccessible
• SVG title and desc elements (labels and descriptions) are now correctly exposed to assistive technology products such as screen readers
• A number of bug fixes and new policies have been implemented in the latest version of Firefox
• Updates to the password policy allow admins to require a primary password (formerly called master password)
• Newly added asynchronous call stacks let developers trace their async code through events, timeouts, and promises
• Erroneous network responses with 4xx/5xx status codes display as errors in the Console, making it easy to understand them in the context of related logs
• JavaScript errors are now visible not only in the Console, but also in the Debugger
• Opening SCSS and CSS-in-JS sources from the Inspector now works more reliably thanks to improved source map handling across all panels
• Inspecting accessibility properties from the browser context menu is now available to all users by default
• OS X 10.9-10.11 are no longer supported. 10.9-10.11 users running Firefox 78 will continue to receive security updates on Firefox ESR 78.

Android

• Enhanced Tracking Protection on by default
• The ability to open as many tabs and organize them into Collections
• Getting into Private Browsing Mode with just one tap
• Ergonomic browsing with the bottom nav bar
• Users can switch to Dark Mode
• Video multitasking with Picture-in-Picture mode
• Powered by the independent GeckoView engine

End-of-life 79.0.x product line^{[failed verification – see discussion]} on August 25, 2020.

Desktop

• Firefox can now be set as the default system PDF viewer
• The name reported by accessibility tools for items in multi-tiered tree controls no longer incorrectly includes information from items at deeper levels, providing users with the correct level of content when using a screen reader
• Various security fixes
• Several crashes while using a screen reader were fixed including a frequently encountered crash when using the JAWS screen reader
• Firefox Developer Tools received significant fixes allowing screen reader users to benefit from some of the tools that were previously inaccessible
• SVG title and desc elements (labels and descriptions) are now correctly exposed to assistive technology products such as screen readers
• A number of animations such as tab loading reduced for users with migraines and epilepsy and reduced motion settings
• The new add-ons blocklist has been enabled to improve performance and scalability
• A number of bug fixes and new policies have been implemented in the latest version of Firefox
• An experimental sidebar panel in the inspector to Firefox Developer Edition that helps developers more quickly identify potential browser compatibility problems based on MDN data
• In the Network Monitor request list, a turtle icon is shown for «slow» requests that exceed a threshold for the waiting time
• Firefox now supports RTX and Transport-cc for improved call quality in poor network conditions and better bandwidth estimation and for better compatibility with many websites using WebRTC

Android

• The Back button is back
  • Users can view tab history with a long-press of any back button
• Various security fixes

Desktop

• Fixed a performance regression when encountering new intermediate CA certificates
• Fixed crashes possibly related to GPU resets
• Fixed rendering on some sites using WebGL
• Fixed the zoom-in keyboard shortcut on Japanese language builds
• Fixed download issues related to extensions and cookies

End-of-life 80.0.x product line^{[failed verification – see discussion]} on September 22, 2020.

Desktop

• Users can pause and play audio or video in Firefox right from their keyboard or headset, giving them easy access to control their media when in another Firefox tab, another program, or even when their computer is locked
• In addition to the default, dark and light themes, with this release, Firefox introduces the Alpenglow theme: a colorful appearance for buttons, menus, and windows
• The ability to save, manage, and auto-fill credit card information for U.S. and Canada users, making shopping on Firefox ever more convenient
• Firefox supports AcroForm, which allows users to fill in, print, and save supported PDF forms, and the PDF viewer also has a new fresh look
• Users in Austria, Belgium and Switzerland using the German version of Firefox will now see Pocket recommendations in their new tab featuring some of the best stories on the web
  • In addition to Firefox’s new tab, Pocket is also available as an app on iOS and Android
• Various security fixes
• Fixed a bug for users of language packs where the default language was reset to English after Firefox updates
• Browser native HTML5 audio/video controls received several important accessibility fixes:
  • Audio/video controls remain accessible to screen readers even when they are temporarily hidden visually
  • Audio/video elapsed and total time are now accessible to screen readers where they weren’t previously
  • Various unlabelled controls are now labelled making them identifiable to screen readers
  • Screen readers no longer intrusively report progress information unless the user requests it
• Users will soon find Picture-in-Picture more easily on all the videos they watch with new iconography
• The bookmarks toolbar is now automatically revealed once bookmarks are imported into Firefox, making it easier to find most important websites
• The expansion of .xml, .svg, and .webp file types
• Various bug fixes and new policies have been implemented in the latest version of Firefox
• TypeScript files are now properly identified in the Debugger panel and labeled with corresponding icons
• HTTP JSON responses using XSSI prevention characters are properly parsed and JSON data presented in a form of an expandable tree
• It’s possible to pause on script first statement, which is useful e.g. in cases where developers want to debug side effects caused by script execution or timers
• The color vision deficiency simulation in the accessibility panel of Developer Tools is now more accurate

Android

• Top requests in the Firefox Daylight release:
  • The ability to view downloads
  • Enhanced search
  • Frequently visited top sites
  • The ability to auto-close tabs
  • The ability to switch tabs by swiping horizontally on address bar
  • Password migration support for master password users
• Various security fixes

Desktop

• Fixed missing content on Blackboard course listings
• Resolved incorrect scaling of Flash content on HiDPI macOS systems
• Fixes for various printing issues
• Fixed legacy preferences not being properly applied when set via GPO
• Fixed Picture-in-Picture controls being visible on audio-only page elements
• Fixed high memory growth with addons such as Disconnect installed, causing browser responsiveness issues over time
• Various stability improvements

Desktop

• Fixed an incompatibility with Twitter.com manifesting itself with the intermittent display of a network protocol violation error page

End-of-life 81.0.x product line^{[failed verification – see discussion]} on October 20, 2020.

Desktop

• A number of improvements that make watching videos more delightful:
  • The Picture-In-Picture button has a new look and position
  • Picture-In-Picture now has a keyboard shortcut for Mac users that works before they start playing the video
  • DirectComposition for hardware decoded video for Windows users, which will improve CPU and GPU usage during video playback, improving battery life
• Improved performance on both page loads and start up time:
  • Websites that use flexbox-based layouts load 20% faster than before
  • Restoring a session is 17% quicker
  • For Windows users, opening new windows got quicker by 10%
• Users can now explore new articles when they save a webpage to Pocket from the Firefox toolbar
• WebRender continues to roll out to more Firefox users on Windows
• Screen reader features which report paragraphs now correctly report paragraphs in Firefox instead of lines
• Various security fixes
• Credit card auto-fill is now more accessible with the card type, and the card number in the card editor now available to screen readers
• Printing dialog errors for invalid form entries are now reported to screen readers
• MediaSession API has been enabled by default which allows web authors to provide custom behaviors for standard media playback interactions, giving them more options than ever
• DevTools now shows server side events in the Network panel

Android

• New ways of making browsing experience better:
  • Users can now reopen their recently closed tabs in the tab tray menu or History panel
  • The ability to automatically purge cookies from sites not directly visited in 30 days
  • Newly supported add-ons: Video Background Play Fix and Google Search Fixer
  • Added a new locale: Tajik
  • Better support for opening links in Firefox from third-party apps
• Various security fixes

Desktop

• Avoided an unnecessary prompt to reboot when using the full installer on Windows
• Restored the ability to print on paper whose width or height is larger than 100 inches, e.g. for receipts
• Fixed printing of documents with margins of zero, e.g. some PDFs
• Fixed handling of the WebDriver:ClickElement command in the marionette testing framework
• Stability fix

Desktop

• Fixed duplication of WebSocket messages in certain cases

Desktop

• Security fix