Firefox Changelog

What's new in Firefox 125.0.2

Apr 23, 2024

FIXED:
Reverted the changes recently shipped in Firefox 125 that more proactively blocked downloads from potentially untrustworthy URLs. The changes caused unexpected problems with downloading files in some situations. We plan to fix and re-enable these protections in a future release. (Bug 1892069)

New in Firefox 125.0.1 (Apr 18, 2024)

New in Firefox 124.0.2 (Apr 3, 2024)

New in Firefox 124.0.1 (Mar 25, 2024)

New in Firefox 123.0.1 (Mar 6, 2024)

New in Firefox 123.0 (Feb 21, 2024)

New:
We’ve integrated search into Firefox View. You can now search through all of the tabs on each of the section subpages - Recent Browsing, Open Tabs, Recently Closed Tabs, Tabs from other devices, or History.
Having any issues with a website on Firefox, yet the site seems to be working as expected on another browser? You can now let us know via the Web Compatibility Reporting Tool! By filing a web compatibility issue, you’re directly helping us detect, target, and fix the most impacted sites to make your browsing experience on Firefox smoother.
Fixed:
When translating web pages, we are now also translating text in tooltips (i.e. titles) and text displayed in form controls (i.e. placeholder).
Various security fixes.
Changed:
Address bar settings can now be found in the Firefox Settings' Search section.
Improved PGO optimizations for macOS ARM64 and Android
Off-main-thread canvas on macOS, Linux and Android
Enterprise:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 123 Release Notes.
Developer:
Developer Information:
The Network Monitor now supports saving a response body to disk through the Save Response As context menu item. This replaces the Save Image context menu item, which only supported saving images.
Web Platform:
We now implement linearRGB interpolation for SVG gradients, as well as the existing sRGB interpolation. You can choose which to use via the color-interpolation property.
Previously, SVG feImage elements that pointed to SVG content required the SVG document to have a root element that had non-percentage width and height values. Such content will now fall back to use the default replaced element values of 300px width and 150px height and the feImage will no longer fail to render.
By enabling Preload and Modulepreload support, Early Hints are now fully supported.
Audio echo cancellation can now be applied to microphone inputs when the audio output is redirected to another device with setSinkId().
Firefox now supports declarative ShadowDOM, providing developers greater flexibility and improved ergonomics when working with ShadowDOMs directly within HTML.
Unresolved:
Some machines with older AMD CPUs may see image thumbnails incorrectly render as all black in file dialogs. If this is the case, updating the graphics driver should address this issue.
Community Contributions:
With the release of Firefox 123, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 9 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Aaron: 1221964
Eliot Jacobs: 1843720, 1860845, 1867908
[email protected]: 1806693
Jon Parise: 1872505
Jordan Petridis: 1871863
Kaiido: 1872237
Kate Galich: 1867610
Redfire: 1872151, 1873317
toe_head2001: 1872457

New in Firefox 122.0.1 (Feb 7, 2024)

New in Firefox 122.0 (Jan 23, 2024)

New in Firefox 121.0.1 (Jan 11, 2024)

New in Firefox 121.0 (Dec 21, 2023)

NEW:
Firefox now prompts Windows users to install the Microsoft AV1 Video Extension to enable hardware decoding support for the AV1 video codec from about:support if not already installed.
Firefox now supports Voice Control commands on macOS systems.
On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.
Note that due to Wayland protocol limitations, Picture-in-Picture windows require an extra user interaction (generally right-click on the window) or a shell / desktop-environment tweak. See bug 1621261 for related discussion and tracking, this post for a KDE configuration, and this extension for GNOME. It is also a known issue that windows are not correctly placed when restoring a previous session on launch.
Firefox can now force links to always be underlined. This option can be enabled in the Browsing section of the Firefox Settings menu.
Screenshot of new Always underline links option
The PDF viewer now includes a floating button to simplify deleting drawings, text, and images added in PDFs.
Screenshot of new floating delete button
FIXED:
Various security fixes.
ENTERPRISE:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 121 Release Notes.
DEVELOPER:
Developer Information:
The Firefox Debugger now includes a new feature: an option to disable the debugger; keyword on the current page. This feature is accessible via a new checkbox in the Breakpoints side panel labeled Pause on debugger statement, located next to the existing Pause on exceptions checkbox. By default, this option is enabled, meaning that the debugger statements are active unless manually disabled.
Screenshot showing new Pause on debugger statement option
As part of our work on improving the accessibility of Firefox Developer Tools, we've unified the focus indicator across the toolbox. The focus indicator is now larger with improved contrast, featuring a white box-shadow for enhanced visibility on blue backgrounds. Adjustments have also been made to ensure clear visibility across shared components and frequently used panels, preventing overlap with element borders or backgrounds.
WEB PLATFORM:
The :has() selector is now supported. This allows authors to match an element that has, or "anchors", at least one element matching its relative selector.
The hanging and each-line keywords are now supported for the text-indent CSS property, offering more convenient paragraph layout options for styles such as bibliographies, poetry, etc.
The balance keyword is now supported for the text-wrap CSS property, which can improve the appearance of short multi-line text blocks such as long headings or captions by harmonizing the line lengths.
Lazy loading iframes are now supported (). Lazy loading iframes are only loaded when visible, so non-critical iframes can load later when needed to speed up initial page loads, reduce initial network usage, etc.
Support has been added for tail call elimination in WebAssembly language to improve support for functional languages.
UNRESOLVED:
Ubuntu Snap builds are not currently defaulting to Wayland compositing on some systems. This will be addressed in a follow-up release.
COMMUNITY CONTRIBUTORS:
With the release of Firefox 121, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 16 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
andreas221b: 1860232
Andy: 1855926
astrid: 1862509
bbhtt: 1863116
Debadree Chatterjee: 1827733, 1831412
Freya: 1857749
jerome: 1861722
Komuhangi Tumuhairwe: 1860231
Luke: 1864331
Mohak: 1862513
Nagata Aptana: 1860230
nzai: 1855726, 1863869
Patryk Gruszka: 1862507, 1864834
RAN1: 1837824
Tamsin: 1840621
Victor Boivie: 1464914, 1859759, 1862740

New in Firefox 120.0.1 (Dec 2, 2023)

New in Firefox 120.0 (Nov 23, 2023)

New:
Firefox supports a new “Copy Link Without Site Tracking” feature in the context menu which ensures that copied links no longer contain tracking information.
Firefox now supports a setting (in Preferences → Privacy & Security) to enable Global Privacy Control. With this opt-in feature, Firefox informs the websites that the user doesn’t want their data to be shared or sold. This feature is enabled in private browsing mode by default
Firefox’s private windows and ETP-Strict privacy configuration now enhance the Canvas APIs with Fingerprinting Protection, thereby continuing to protect our users’ online privacy.
Firefox is rolling-out Cookie Banner Blocker by default in private windows for users in Germany during the coming weeks. Firefox will now auto-refuse cookies and dismiss annoying cookie banners for supported sites.
Firefox has enabled URL Tracking Protection by default in private windows for all users in Germany. Firefox will remove non-essential URL query parameters that are often used to track users across the web.
Firefox now imports TLS trust anchors (e.g., certificates) from the operating system root store. This will be enabled by default on Windows, macOS, and Android, and if needed, can be turned off in settings (Preferences → Privacy & Security → Certificates).
Keyboard shortcuts have now been added for editing and deleting a selected credential on about:logins. For editing - Alt + enter (Option + return on macOS) and for deleting - Alt + Backspace (Option + Delete on macOS).
Users on Ubuntu Linux now have the ability to import from Chromium when both are installed as Snap packages.
Picture-in-Picture now supports corner snapping on Windows and Linux - just hold Ctrl as you move the PiP window.
Fixed:
Various security fixes.
Enterprise:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 120 Release Notes.
Developer:
Developer Information:
The User Activation API has now been added, allowing JavaScript to check if the user currently is or has been active with the page (clicking, etc) with navigator.userActivation.
Early Hints Preconnect, the informational status code 103, is now enabled. This allows servers to send resource Link headers before the final HTTP response and improves performance on servers using this feature. (read more)
Users can now use an added devtools feature to simulate browser tabs to be offline.
The Style Editor panel now features a new "Pretty Print" button located in the footer of the panel, similar to the pretty print button found in the Debugger panel. This can be used to format stylesheets (e.g., those that are minified). The previous functionality, where minified files were automatically formatted, has been removed.
The Rules panel within the Inspector panel no longer displays colors in the new CSS Color 4 formats (e.g., OKLCH) as hexadecimal/named colors. This ensures that it matches the original values used.
Web Platform:
lh and rlh units can now be parsed and computed correctly as lengths. This allows authors to specify lengths in terms of the element's (or the root element's) line height.
WebAssembly GC is now enabled by default, which allows new languages, such as Dart or Kotlin, to run on Firefox. This makes it possible for reference cycles between the guest language and host browser to be collected.
Unresolved:
We're aware of a startup crash affecting Linux users on some aarch64 systems, those with page sizes other than 4KB such as Apple Silicon. To workaround the issue compile Firefox with --disable-phc.
Community Contributions:
With the release of Firefox 120, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 10 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Ajay: 1857745, 1857750
Alexander Sergeyev: 1855731
Antoine: 1857751
Calum Smith [:cpmsmith]: 1859079
Fidelius: 1856287
Kushal Pokharel: 1857752
Scott Jehl: 1836128, 1841432
Sebastian [:sebcode]: 366374
tiuna.angelini: 1857747
vitaspiros: 1013947

New in Firefox 119.0.1 (Nov 8, 2023)

New in Firefox 118.0.2 (Oct 11, 2023)

New in Firefox 118.0.1 (Sep 29, 2023)

New in Firefox 118.0 (Sep 27, 2023)

New in Firefox 117.0.1 (Sep 13, 2023)

New in Firefox 117.0 (Sep 1, 2023)

NEW:
Support for credit card autofill has been extended to users running Firefox in the IT, ES, AT, BE, and PL locales.
macOS users can now control the tabability of controls and links via about:preferences.
To avoid undesirable outcomes on sites which specify their own behavior when pressing shift+right-click, Firefox now has a dom.event.contextmenu.shift_suppresses_event preference to prevent the context menu from appearing.
FIXED:
YouTube video lists now scroll correctly when navigating with a screen reader.
Various security fixes.
CHANGED:
Firefox no longer shows its own screen sharing indicator on Wayland desktop environments. The system default sharing indicator will be used instead
ENTERPRISE:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 117 Release Notes.
DEVELOPER:
Web compatibility inspection has been enhanced with our new CSS compatibility tooltip in the Developer Tools Inspector. An icon is now displayed next to properties that could lead to web compatibility issues. When hovered, the tooltip indicates which browsers are not supported and displays a link to the MDN page for the property so the user can learn more about it.
WEB PLATFORM:
Support for improved CSS nesting is now enabled by default.
Firefox now supports RTCRtpScriptTransform.
ReadableStream.from is now supported, allowing creation of a ReadableStream from an (async) iterable.
Firefox now supports the math-style and math-depth CSS properties and the font-size: math value.
COMMUNITY CONTRIBUTIONS:
With the release of Firefox 117, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 9 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Cassio Neri: 1828326
David Turner: 1836063
Devesh Bisen: 1840583, 1841131
Lin Runze: 1842131
Logan Rosen [:Logan]: 1692849, 1843815
ren: 1753033, 1842971, 1844492
Vinny Diehl: 1262782, 1707974
Willy R. Vasquez: 1829765, 1843418, 1843419, 1845186, 1845798
Xi Ruoyao: 1841040

New in Firefox 116.0.3 (Aug 18, 2023)

New in Firefox 116.0.2 (Aug 8, 2023)

New in Firefox 116.0.1 (Aug 7, 2023)

New in Firefox 115.0.3 (Jul 28, 2023)

New in Firefox 115.0.2 (Jul 13, 2023)

New in Firefox 115.0.1 (Jul 7, 2023)

New in Firefox 115.0 (Jul 4, 2023)

NEW:
Migrating from another browser? Now you can bring over payment methods you've saved in Chrome-based browsers to Firefox.
Hardware video decoding is now enabled for Intel GPUs on Linux.
The Tab Manager dropdown now features close buttons, so you can close tabs more quickly.
We've refreshed and streamlined the user interface for importing data in from other browsers.
Users without platform support for H264 video decoding can now fallback to Cisco's OpenH264 plugin for playback.
FIXED:
Windows Magnifier now follows the text cursor correctly when the Firefox title bar is visible.
Windows users on low-end/USB wifi drivers and with OS geolocation disabled can now approve geolocation on a case by case basis without causing system-wide network instability.
Various security fixes.
CHANGED:
Undo and redo are now available in Password fields.
On Linux, middle clicks on the new tab button will now open the xclipboard contents in the new tab. If the xclipboard content is a URL then that URL is opened, any other text is opened with your default search provider.
For users with a Firefox Colorways built-in theme, the theme will be automatically migrated to the same theme hosted on addons.mozilla.org for Firefox profiles that have disabled add-ons auto-updates. This will allow users to keep their Colorways theme when they are later removed from Firefox installer files.
Certain Firefox users may come across a message in the extensions panel indicating that their add-ons are not allowed on the site currently open. We have introduced a new back-end feature to only allow some extensions monitored by Mozilla to run on specific websites for various reasons, including security concerns.
ENTERPRISE:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 115 Release Notes.
DEVELOPER:
Developer Information
In web development, we rely on third-party libraries which you may not be interested in while debugging. These can be ignored. Ignoring them means that breakpoints will not get hit and they are skipped during stepping.
You can now choose to Hide ignore-listed sources in the Developer Tools source tree (bug).
developer tools screenshot of the Hide ignore-listed sources option
Ignored sources are also skipped by JavaScript tracing feature (bug).
We have introduced a new option, devtools.f12_enabled, that can be utilized to prevent the accidental use of the F12 key, which opens the DevTools toolbox (bug).
WEB PLATFORM:
The builtin editor now behaves similarly to other browsers with contenteditable and designMode when splitting a node, e.g. typing Enter to split a paragraph, and also when joining two nodes, e.g. typing Backspace at the start of a paragraph to join the paragraph and the previous one.
When a node is split, the builtin editor creates a new node after the original one instead of before, i.e. creates the right node instead of the left node.
Similarly, when two nodes are joined, the builtin editor deletes the latter node and moves its children to the end of the preceding node instead of deleting the former node and moving its child to the start of the following node.
WebRTC application developers can now specify a target in milliseconds of media for the jitter buffer to hold. Altering the target value allows applications to control the tradeoff between playout delay and the risk of running out of audio or video fraalso in private browsingmes due to network jitter.
Change array by copy provides additional methods on Array.prototype and TypedArray.prototype to enable changes on the array by returning a new copy of it with the change.
The animation-composition property is now supported, allowing a declarative way to define the composite operation used when multiple animations affect the same property simultaneously.
Added the URL.canParse() function to allow easy and fast checking if URLs are valid and parseable.
IndexedDB is now also supported in private browsing without memory limits thanks to encrypted storage on disk. The temporary keys to decrypt the information are hold in RAM only and all stored information is purged at the normal end of a private browsing session from disk.
Supports conditions are now supported in CSS import rules @import supports(...)
COMMUNITY CONTRIBUTIONS:
With the release of Firefox 115, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 8 of whom were brand new volunteers!
Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Anton Bobrov: 1833330
Brice Laurencin: 1418462
LyScott123: 1788013
Martín González Gómez: 1827565
michael s: 1787997
Sam Kravitz: 1832402
sankalp.shubham99: 1831587
Tom Marble: 1832629

New in Firefox 114.0.2 (Jun 20, 2023)

New in Firefox 114.0.1 (Jun 10, 2023)

New in Firefox 114.0 (Jun 7, 2023)

New in Firefox 113.0.2 (May 23, 2023)

New in Firefox 113.0.1 (May 13, 2023)

New in Firefox 113.0 (May 10, 2023)

NEW:
Say hello to enhanced Picture-in-Picture! Rewind, check video duration, and effortlessly switch to full-screen mode on the web's most popular video websites.
Firefox's address bar is already a great place to search for what you're looking for. Now you'll always be able to see your web search terms and refine them while viewing your search's results - no additional scrolling needed! Also, a new result menu has been added making it easier to remove history results and dismiss sponsored Firefox Suggest entries.
Image demonstrating search terms persisting in the address bar after hitting Enter for easier editing
Private windows now protect users even better by blocking third-party cookies and storage of content trackers.
Passwords automatically generated by Firefox now include special characters, giving users more secure passwords by default.
Firefox 113 introduces a redesigned accessibility engine which significantly improves the speed, responsiveness, and stability of Firefox when used with:
Screen readers, as well as certain other accessibility software;
East Asian input methods;
Enterprise single sign-on software; and
Other applications which use accessibility frameworks to access information.
Importing bookmarks from Safari or a Chrome-based browser? The favicons for those bookmarks will now also be imported by default to make them easier to identify.
Firefox 113 now supports AV1 Image Format files containing animations (AVIS), improving support for AVIF images across the web.
The Windows GPU sandbox first shipped in the Firefox 110 release has been tightened to enhance the security benefits it provides.
A 13-year-old feature request was fulfilled and Firefox now supports files being drag-and-dropped directly from Microsoft Outlook. A special thanks to volunteer contributor Marco Spiess for helping to get this across the finish line!
Users on macOS can now access the Services sub-menu directly from Firefox context menus.
On Windows, the elastic overscroll effect has been enabled by default. When two-finger scrolling on the touchpad or scrolling on the touchscreen, you will now see a bouncing animation when scrolling past the edge of a scroll container.
Firefox is now available in the Tajik (tg) language.
FIXED:
Various security fixes.
CHANGED:
The long-deprecated mozRTCPeerConnection, mozRTCIceCandidate, and mozRTCSessionDescription WebRTC interfaces have been removed. Sites should utilize the non-prefixed versions instead.
DEVELOPER:
Developer Information
There have been numerous improvements to the Debugger's "Search in files" feature (also known as "Project search"):
The panel has been moved to a regular side panel, which allows you to keep the results list visible while opening scripts in the editor;
Results from minified and pretty-printed tabs, as well as matches from the node_modules folder, are displayed;
Results from ignored files are hidden; and
Glob patterns and search modifiers are also supported, making it possible to execute case-sensitive or regex searches on specific parts of your project.
Additional features include support for pretty printing inline scripts in HTML files and column breakpoints in pretty printed sources.
It is now possible to override a JavaScript file in the debugger. In the Debugger, under the Sources tree, you can use the "Add script override" context menu entry. This action will download the file onto your machine, allowing you to edit it. After reloading the page, the local file will be loaded instead of the original script (indicated by a purple icon when a file is overridden).
Screenshot of new script override debugger option
WEB PLATFORMS:
Module scripts can now import other ES module scripts on worklets.
Firefox 113 includes new CSS functionality, including improved support for the color (level 4) specification (such as the lab(), lch(), oklab(), oklch(), and color() functions) and the scripting media query.
Firefox 113 adds support for a number of WebRTC features for improved interoperability: RTCMediaSourceStats, RTCPeerConnectionState, RTCPeerConnectionStats ("peer-connection" RTCStatsType), RTCRtpSender.setStreams(), and RTCSctpTransport.
The forced-color-adjust property is now supported, allowing authors to opt an element out of color changes in Forced Color Mode for improved readability where the automatically-picked contrasting colors are not ideal.
COMMUNITY CONTRIBUTIONS:
With the release of Firefox 113, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 28 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Abhijeet Chawla [:ff2400t]: 1589474, 1737050
anayocrescent2: 1814427, 1817015
Anwar Sadat Ayub: 1817016, 1821901, 1822336
Blessing Peters: 1670436
cathiechen: 1822521, 1823060, 1823897, 1824823
ChaseKnowlden: 1812638
Denis Kisavi (:kisavi): 1823719, 1824389
divyaramaswamy2: 1820282
Ebilite Uchenna: 1814426, 1820209, 1820256, 1823710, 1825129
Ekene Nwobodo: 1822221, 1822361
Emanuele Rocca: 1822827
Ganna: 1802364, 1814270, 1821159, 1821162, 1821704, 1822011
ianiket23: 1820882
Lata: 1791414, 1818513, 1820284, 1821191, 1821625, 1821897, 1823612
Leila Kaltouma: 1768694, 1820880
lplanch: 1559986
marco.spiess: 580928
Masashi Hirano: 1753682
maxim.cournoyer: 1817032
ntshangase: 1820616
ogiorgis: 1822030
omega judith: 1822985, 1823716
Pushpanjali: 1821900
Saira: 1771549, 1821039, 1822222, 1824608
Sauvic Paul Choudhury[:sauvic]: 1821299, 1821899
Shah: 1814422, 1820821, 1824605
Shreya Shah [:shasha]: 1791441
Victoria Ajala: 1819174, 1821086

New in Firefox 112.0.2 (Apr 26, 2023)

New in Firefox 112.0.1 (Apr 18, 2023)

New in Firefox 113.0b2 Beta (Apr 12, 2023)

NEW:
Right-clicking on password fields now shows an option to reveal the password.
Ubuntu Linux users can now import their browser data from the Chromium Snap package. Currently, this will only work if Firefox is not also installed as a Snap package, but work is underway to address this!
Do you use the tab list panel in the tab bar? If so, you can now close tabs by middle-clicking items in that list.
You've always been able to un-close a tab by using (Cmd/Ctrl)-Shift-T. Now, that same shortcut will restore the previous session if there are no more closed tabs from the same session to re-open.
For all ETP Strict users, we extended the list of known tracking parameters that are removed from URLs to further protect our users from cross-site tracking.
Enables overlay of software-decoded video on Intel GPUs in Windows. Improves video down scaling quality and reduces GPU usage.
FIXED:
Various security fixes.
CHANGED:
The deprecated U2F Javascript API is now disabled by default. The U2F protocol remains usable through the WebAuthn API. The U2F API can be re-enabled using the security.webauth.u2f preference.
ENTERPRISE:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 112 Release Notes.
DEVELOPER:
Developer Information
WEB PLATFORM:
Clear button, newly added to the date picker panel, allows users to quickly clear the input with type date or datetime-local and provides a familiar experience across browsers.
COMMUNITY CONTRIBUTORS:
With the release of Firefox 112, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 14 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
yawkat: 1807531
grulja: 1816431, 1818530, 1819035
ofrazy: 1810101
zqianem: 1814469
Abhishek: 1818767, 1820881
Andreu Botella: 1812511
Cristina Horotan: 1821327
Daniel Seither: 1720257
Filip Š: 1747722
Khadija Kamran khadija kkamran: 1809912
Mihai Adrian Carare: 1802817, 1813671
Noah Osuolale: 1821296, 1821392
Rebeca Tudor: 1812249
Saksham Mittal: 1801161
Siya: 1820639
Theo Buehler: 1817588
mgomes: 1819355
twhite: 1818802, 1821021

New in Firefox 112.0 (Apr 12, 2023)

NEW:
Right-clicking on password fields now shows an option to reveal the password.
Ubuntu Linux users can now import their browser data from the Chromium Snap package. Currently, this will only work if Firefox is not also installed as a Snap package, but work is underway to address this!
Do you use the tab list panel in the tab bar? If so, you can now close tabs by middle-clicking items in that list.
You've always been able to un-close a tab by using (Cmd/Ctrl)-Shift-T. Now, that same shortcut will restore the previous session if there are no more closed tabs from the same session to re-open.
For all ETP Strict users, we extended the list of known tracking parameters that are removed from URLs to further protect our users from cross-site tracking.
Enables overlay of software-decoded video on Intel GPUs in Windows. Improves video down scaling quality and reduces GPU usage.
FIXED:
Various security fixes.
CHANGED:
The deprecated U2F Javascript API is now disabled by default. The U2F protocol remains usable through the WebAuthn API. The U2F API can be re-enabled using the security.webauth.u2f preference.
ENTERPRISE:
You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 112 Release Notes.
DEVELOPER:
Developer Information
WEB PLATFORM:
Clear button, newly added to the date picker panel, allows users to quickly clear the input with type date or datetime-local and provides a familiar experience across browsers.
COMMUNITY CONTRIBUTORS:
With the release of Firefox 112, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 14 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
yawkat: 1807531
grulja: 1816431, 1818530, 1819035
ofrazy: 1810101
zqianem: 1814469
Abhishek: 1818767, 1820881
Andreu Botella: 1812511
Cristina Horotan: 1821327
Daniel Seither: 1720257
Filip Š: 1747722
Khadija Kamran khadija kkamran: 1809912
Mihai Adrian Carare: 1802817, 1813671
Noah Osuolale: 1821296, 1821392
Rebeca Tudor: 1812249
Saksham Mittal: 1801161
Siya: 1820639
Theo Buehler: 1817588
mgomes: 1819355
twhite: 1818802, 1821021

New in Firefox 111.0.1 (Mar 22, 2023)

New in Firefox 111.0 (Mar 14, 2023)

New in Firefox 110.0.1 (Mar 1, 2023)

New in Firefox 111.0b3 Beta (Feb 21, 2023)

New in Firefox 110.0 (Feb 14, 2023)

Version 110.0, first offered to Release channel users on February 14, 2023
NEW:
It's now possible to import bookmarks, history and passwords not only from Edge, Chrome or Safari but also from Opera, Opera GX, and Vivaldi for all the folks who want to move over to Firefox instead!
GPU sandboxing has been enabled on Windows.
Note: A bug in the popular X-Mouse Button Control (XMBC) tool may cause mouse wheel scrolling to stop working. The author(s) are working on an update. Meanwhile, scrolling can be restored by reconfiguring XMBC: either disable the Make scroll wheel scroll window under cursor option in the global settings, or enable the Disable scroll window under cursor option if using a custom profile for Firefox.
On Windows, third-party modules can now be blocked from injecting themselves into Firefox, which can be helpful if they are causing crashes or other undesirable behavior.
Date, time, and datetime-local input fields can now be cleared with Cmd+Backspace and Cmd+Delete shortcut on macOS and Ctrl+Backspace and Ctrl+Delete on Windows and Linux.
GPU-accelerated Canvas2D is enabled by default on macOS and Linux.
WebGL performance improvement on Windows, MacOS and Linux.
Enables overlay of hardware-decoded video with non-Intel GPUs on Windows 10/11, improving video playback performance and video scaling quality.
FIXED:
Various security fixes.
CHANGED:
Colorways are no longer available in Firefox, at least not in the same way. You can still access your saved and active Colorways by selecting Add-ons and themes from the Firefox menu. Additionally, you can now install Colorways from all of the previous collections by visiting Colorways by Firefox on the Mozilla Add-ons website.
ENTERPRISE:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 110 Release Notes.
WEB PLATFORM:
Firefox now supports CSS named pages, allowing web pages to perform per-page layout and add page-breaks in a declarative manner when printing.
Firefox now supports CSS size container queries, see the MDN page for documentation on this feature.

New in Firefox 109.0.1 (Feb 3, 2023)

New in Firefox 109.0 (Jan 18, 2023)

NEW:
Manifest Version 3 (MV3) extension support is now enabled by default (MV2 remains enabled/supported). This major update also ushers an exciting user interface change in the form of the new extensions button.
The Arbitrary Code Guard exploit protection has been enabled in the media playback utility processes, improving security for Windows users.
The native HTML date picker for date and datetime inputs can now be used with a keyboard alone, improving its accessibility for screen reader users. Users with limited mobility can also now use common keyboard shortcuts to navigate the calendar grid and month selection spinners.
Firefox builds in the Spanish from Spain (es-ES) and Spanish from Argentina (es-AR) locales now come with a built-in dictionary for the Firefox spellchecker.
FIXED:
Various security fixes.
CHANGED:
Effective on January 16, Colorways will no longer be in Firefox. Users will still be able to access saved and active Colorways from the Add-ons and themes menu option.
On macOS, Ctrl or Cmd + trackpad or mouse wheel now scrolls the page instead of zooming. This avoids accidental zooming and matches the behavior of other web browsers on macOS.
The Recently Closed section of Firefox View now equips users with the ability to manually close/remove url links from the list.
The empty state messages and graphic components surfaced in Firefox View for the Tab Pickup and Recently Closed sections have been updated for an improved user experience.
ENTERPRISE:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 109 Release Notes.
DEVELOPER:
Developer Information:
The ability to automatically break when code on the page hits an events handler has been available since Firefox 69. Firefox 109 now adds new support for the scrollend event. To use this new event breakpoint, open the JS debugger and find and expand the Event Listener Breakpoints section in the right hand column (learn more).
Screenshot of Breakpoint options showing new scrollend event availability
WEB PLATFORM:
The scrollend event is now enabled by default. The event is fired when a scroll has completed.
Firefox now permanently partitions Storage in third-party contexts independent of Storage Access to align with other browsers and provide better Web compatibility.
COMMUNITY CONTRIBUTIONS:
Razvan Cojocaru: Bug 1685648, Bug 1800530

New in Firefox 108.0.2 (Jan 5, 2023)

New in Firefox 108.0.1 (Dec 20, 2022)

New in Firefox 108.0 (Dec 14, 2022)

New in Firefox 107.0.1 (Nov 29, 2022)

New in Firefox 107.0 (Nov 16, 2022)

New in Firefox 106.0.5 (Nov 6, 2022)

New in Firefox 106.0.4 (Nov 3, 2022)

New in Firefox 106.0.3 (Oct 31, 2022)

New in Firefox 106.0.2 (Oct 26, 2022)

New in Firefox 106.0.1 (Oct 20, 2022)

New in Firefox 106.0 (Oct 19, 2022)

NEW:
It is now possible to edit PDFs: including writing text, drawing, and adding signatures.
Setting Firefox as your default browser now also makes it the default PDF application on Windows systems.
You can now pin private windows to your Windows taskbar on Window 10 and Windows 11 for simpler access. Also, private windows have been redesigned to increase the feeling of privacy.
Swipe-to-navigate (two fingers on a touchpad swiped left or right to perform history back or forward) now works for Linux users on Wayland.
Text Recognition in images allows users on macOS 10.15 and higher to extract text from the selected image (such as a meme or screenshot).
Extracted text is copied to the clipboard in order to share, store, or search—without needing to manually retype everything.
This feature is compatible with “VoiceOver,” the built-in macOS
screen reader.
“Firefox View” helps you get back to content you previously discovered. A pinned tab allows you to find and open recently closed tabs on your current device, access tabs from other devices (via our “Tab Pickup” feature), and change the look of the browser (with Colorways).
With the launch of the “Independent Voices” collection, Firefox is introducing 18 new “Colorways.” You can now access a “Colorways” modal experience via “Firefox View”; each new color is accompanied with a bespoke graphic and a text description that speaks to its deeper meaning. The collection will be available through Jan 16.
Web Platform:
A major upgrade to our WebRTC capabilities (libwebrtc library upgraded from version 86 to 103) brings multiple improvements:
Better screen sharing for Windows and Linux Wayland users.
Lower CPU usage and increased frame rates during WebRTC screen capture on macOS.
RTP performance and reliability improvements.
Richer statistics.
Cross-browser and service compatibility improvements.
Community Contributions:
With the release of Firefox 106, we are honored to welcome all the contributors who've volunteered their time and talent to make Firefox better—14 of them were brand new volunteers. Please join us in expressing our gratitude for their efforts, and take a look at their contributions:
amabb: Bug 1739381
aw4910819: Bug 1573830
axtinemvsn: Bug 1788765 and Bug 1788927
b1: Bug 1788901
justchenabc: Bug 1789765
samronning: Bug 1786402
Alvin: Bug 1788931
Avery: Bug 1788780
Basix: Bug 1787280
Brian Pham: Bug 1788776
Byoungchan Lee: Bug 1785953
Eugene Simakin: Bug 1595119
Pat McGhen: Bug 1743334
Zach Harris: Bug 1788769

New in Firefox 105.0.3 (Oct 10, 2022)

New in Firefox 105.0.2 (Oct 4, 2022)

New in Firefox 105.0.1 (Sep 23, 2022)

New in Firefox 105.0 (Sep 21, 2022)

New in Firefox 104.0.2 (Sep 7, 2022)

New in Firefox 104.0.1 (Aug 30, 2022)

New in Firefox 104.0 (Aug 24, 2022)

New in Firefox 103.0.2 (Aug 9, 2022)

New in Firefox 103.0.1 (Aug 3, 2022)

New in Firefox 103.0 (Jul 28, 2022)

Version 103.0, first offered to Release channel users on July 26, 2022
NEW:
Improved responsiveness on macOS during periods of high CPU load by switching to a modern lock API.
Do you always forget something? Required fields are now highlighted in PDF forms.
improved performance on high-refresh rate monitors (120Hz+).
Enjoying Picture-in-Picture subtitles feature? It just got better: you can now change subtitles font size directly from the PiP window. Additionally, PiP subtitles are now available at Funimation, Dailymotion, Tubi, Hotstar, and SonyLIV.
Buttons in the Tabs toolbar can now be reached with Tab, Shift+Tab, and Arrow keys. View this article for additional details.
Windows' "Make text bigger" accessibility setting now affects all the UI and content pages, rather than only applying to system font sizes.
Rejoice! You can now conveniently access Firefox, which will now be pinned to the Windows taskbar during installation on Windows 10 and 11. (This will also allow for Firefox to be launched quicker after installing.)
FIXED:
Non-breaking spaces are now preserved—preventing automatic line breaks—when copying text from a form control.
Fixed WebGL performance issues on NVIDIA binary drivers via DMA-Buf on Linux.
Fixed an issue in which Firefox startup could be significantly slowed down by the processing of Web content local storage. This had the greatest impact on users with platter hard drives and significant local storage.
VARIOUS SECURITY CHANGES:
Changed:
Removed a configuration option to allow SHA-1 signatures in certificates: SHA-1 signatures in certificates—long since determined to no longer be secure enough—are now not supported.
WEB PLATFORMS:
Your information now has increased protection from online tracking via Total Cookie Protection enabled by default. All third-party cookies are now isolated into partitioned storage.
COMMUNITY CONTRIBUTIONS:
With the release of Firefox 103, we are pleased to welcome the developers who've contributed their first code changes to Firefox in this release; 12 of whom were first time contributors! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
martinh: Bug 1475232
Anthony Hung: Bug 1774385
Eng_Esther: Bug 1741787
Janika Neuberger: Bug 1775011
Jason Prickett: Bug 1770067
Jon Gjengset: Bug 1710421
Pierre de La Morinerie: Bug 359303
Salil Mishra: Bug 1771760
Seweryn Pajor: Bug 1769485
Wong Yi Xiong: Bug 1768675 and Bug 1770545
Zoltán Szatmáry: Bug 1595635 and Bug 1766821
kingwl: Bug 1704385

New in Firefox 102.0.1 (Jul 8, 2022)

New in Firefox 102.0 (Jul 4, 2022)

New in Firefox 101.0.1 (Jun 9, 2022)

New in Firefox 101.0 (May 31, 2022)

NEW:
Reading is now easier with the prefers-contrast media query, which allows sites to detect if the user has requested that web content is presented with a higher (or lower) contrast.
It’s your choice! All non-configured MIME types can now be assigned a custom action upon download completion.
Firefox now allows users to use as many microphones as you want, at the same time, during video conferencing. The most exciting benefit is that you can easily switch your microphones at any time (if your conferencing service provider enables this flexibility).
FIXED:
Various security fixes.
ENTERPRISE:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 101 Release Notes.
DEVELOPER:
Developer Information
Inspector panel: When adding/removing a class name to/from an existing HTML element (using .cls button in Rules View), an autocomplete drop down automatically offers all existing class names on the page. In Firefox 101 the selected class name in the autocomplete drop-down list is auto-applied immediately as the user changes the selection of the autocomplete list (using up/down arrow keys). This is especially useful for quick testing of various styles.
Inspector panel: This new option can be used to disable “drag to update” features in the Rule View (values of some CSS properties e.g., sizes can be modified by dragging the mouse horizontally).
Screenshot showing Inspector Panel drag to update option checkbox
WebDriver BiDi: This protocol is enabled on the release channel to support external tools such as Selenium, which plan to start using WebDriver BiDi for Firefox. WebDriver-BiDi aims to provide a cross-browser protocol for browser automation that meets the requirements of modern web application testing tools. This allows both the client and the server to send & receive requests and responses.
WEB PLATFORMS:
Firefox new has added support for large, small, dynamic viewport units and logical ones (*vi and *vb). This gives users the flexibility to choose whether page elements are sized to the “smallest” viewport size (dynamic toolbar visible), “largest” viewport size (dynamic toolbar hidden), or “dynamic” viewport size (based on current status of dynamic toolbar).
Firefox 101 features added web conferencing support for enumerating (reducing errors caused by transposing or mistyping numbers) and selecting multiple audio input devices (giving you the ability to record or process multiple separate audio sources together, synchronously, at once) through navigator.mediaDevices.enumerateDevices().
COMMUNITY CONTRIBUTORS:
With the release of Firefox 101, we are pleased to welcome all the developers who contributed their first code change to Firefox in this release. Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
av: Bug 1762483 and Bug 1763262
irwp: Bug 1762785 and Bug 1762909
johann.koenig: Bug 1759324
karnikk1406120: Bug 1762683 and Bug 1763000
Manisha.singh2019: Bug 1739139, Bug 1763865, and Bug 1765459
michel: Bug 1661450
Samuraix221: Bug 1708511 and Bug 1762459
aline_g: Bug 1765639
Dmitrij Feller: Bug 1757751 and Bug 1766409
Jakub Šebek: Bug 1764118
Janvi Bajoria: Bug 1763717
Max: Bug 1762316 and Bug 1762499
Michel Le Bihan: Bug 1706354 and Bug 1764541
Roy Christo: Bug 1762749
Simon McVittie: Bug 1494436
sayuree: Bug 1624984, Bug 1666456, Bug 1702491, and Bug 1762259

New in Firefox 100.0.2 (May 20, 2022)

New in Firefox 100.0.1 (May 16, 2022)

New in Firefox 100.0 (May 3, 2022)

NEW:
We now support captions/subtitles display on YouTube, Prime Video, and Netflix videos you watch in Picture-in-Picture. Just turn on the subtitles on the in-page video player, and they will appear in PiP.
Picture-in-Picture now also supports video captions on websites that use WebVTT (Web Video Text Track) format, like Coursera.org, Canadian Broadcasting Corporation, and many more.
On the first run after install, Firefox detects when its language does not match the operating system language and offers the user a choice between the two languages.
Firefox spell checking now checks spelling in multiple languages. To enable additional languages, select them in the text field’s context menu.
HDR video is now supported in Firefox on Mac—starting with YouTube! Firefox users on macOS 11+ (with HDR-compatible screens) can enjoy higher-fidelity video content. No need to manually flip any preferences to turn HDR video support on—just make sure battery preferences are NOT set to “optimize video streaming while on battery”.
Hardware accelerated AV1 video decoding is enabled on Windows with supported GPUs (Intel Gen 11+, AMD RDNA 2 Excluding Navi 24, GeForce 30). Installing the AV1 Video Extension from the Microsoft Store may also be required.
Video overlay is enabled on Windows for Intel GPUs, reducing power usage during video playback.
Improved fairness between painting and handling other events. This noticeably improves the performance of the volume slider on Twitch.
Scrollbars on Linux and Windows 11 won't take space by default. On Linux, users can change this in Settings. On Windows, Firefox follows the system setting (System Settings > Accessibility > Visual Effects > Always show scrollbars).
Firefox now supports credit card autofill and capture in the United Kingdom.
Firefox now ignores less restricted referrer policies—including unsafe-url, no-referrer-when-downgrade, and origin-when-cross-origin—for cross-site subresource/iframe requests to prevent privacy leaks from the referrer.
FIXED:
Users can now choose preferred color schemes for websites. Theme authors can now make better decisions about which color scheme Firefox uses for menus. Web content appearance can now be changed in Settings.
Beginning in this release, the Firefox installer for Windows is signed with a SHA-256 digest, rather than SHA-1. Update KB4474419 is required for successful installation on a computer running Microsoft Windows 7. For more details about this update, visit the Microsoft Technical Support website.
In macOS 11+ we now only rasterize the fonts once per window. This means that opening a new tab is fast, and switching tabs in the same window is also fast. (There's still work to do to share fonts across windows, or to reduce the time it takes to initialize these fonts.)
The performance of deeply-nested display: grid elements is greatly improved.
Support for profiling multiple java threads has been added.
Soft-reloading a web page will no longer cause revalidation for all resources.
Non-vsync tasks are given more time to run, which improves behavior on Google docs and Twitch.
Geckoview APIs have been added to control the start/stop time of capturing a profile.
Various security fixes.
CHANGED:
Firefox has a new focus indicator for links which replaces the old dotted outline with a solid blue outline. This change unifies the focus indicators across form fields and links, which makes it easier to identify the focused link, especially for users with low vision.
New users can now set Firefox as the default PDF handler when setting Firefox as their default browser.
Some websites might not work correctly in Firefox version 100 due to Firefox's new three-digit number. You can read about it in our blog post here!
See the Mozilla Support article Difficulties opening or using a website in Firefox 100 for possible workarounds you can use. There, you will also find instructions for reporting a broken website so that Mozilla can help fix the problem.

New in Firefox 99.0.1 (Apr 12, 2022)

New in Firefox 99.0 (Apr 5, 2022)

New in Firefox 98.0.2 (Mar 24, 2022)

New in Firefox 98.0.1 (Mar 15, 2022)

New in Firefox 98.0 (Mar 9, 2022)

NEW:
Firefox has a new optimized download flow. Instead of prompting every time, files will download automatically. However, they can still be opened from the downloads panel with just one click. Easy!
You’ll find you have a number of options, including:
Always Open Similar Files: Make Firefox automatically open downloaded files of the same type with the system default application.
Show In Folder: Open the folder that contains your downloaded files.
Go To Download Page: Surfaces the download reference page even after leaving the site or closing the tab.
Copy Download Link: Copy the download link to share it, save it, or for any applicable use.
Delete: You can now delete downloaded files directly from the download panel and other download views using the context menu.
Remove From History: Remove a file from your list of downloaded files.
Clear Preview Panel: Clear the list of downloaded items in the preview panel that opens when you start a download.
In this release, you’ll also see that Firefox no longer asks what to do for each file by default. You won’t be prompted to choose a helper application or save to disk before downloading a file unless you have changed your download action setting for that type of file.
And now, every time you start a download, Firefox will automatically bring up the Downloads panel by default. This means you’ll experience minimal interruptions and easily find your downloaded files. Plus, to avoid having to close it several times, the panel won't show if there are multiple downloads in progress.
You can now click on a file in the Downloads panel to open it even before it has finished downloading. Firefox will open the file as soon as it is available. Firefox: saving you time and helping you get back to what you care about!
Any files you download will be immediately saved on your disk. Depending on the current configuration, they’ll be saved in your preferred download folder, or you’ll be asked to select a location for each download. Windows and Linux users will find their downloaded files in the destination folder. They’ll no longer be put in the Temp folder.
Firefox allows users to choose from a number of built-in search engines to set as their default. In this release, some users who had previously configured a default engine might notice their default search engine has changed since Mozilla was unable to secure formal permission to continue including certain search engines in Firefox.
FIXED:
Now, you can set a default app to open a file type. Choose the application you want to use to open files of a specific type in your Firefox settings.
After updating to Firefox version 98, "Always ask" download actions will now be reset.
Various security fixes.
ENTERPRISE:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can find more information in the Firefox for Enterprise 98 Release Notes.
DEVELOPER:
Developer Information:
The Compatibility sidebar panel in the DevTools Inspector already available on pre-release channels will become available on the release channel in version 98 . It provides compatibility warnings for the CSS properties used on the selected element, as well as for the overall page.
Developers may use it to detect web-compatibility issues early, without having to test in each browser. All compatibility data are pulled from MDN.
Event listeners for a given node can now be disabled from the Inspector Event Tooltip, in the markup view. Also, The "event" badge style is updated when at least one event is disabled to remind the user that something was changed.
New UI in the Browser Toolbox to toggle Fluent pseudolocalization bidi / accented
“Ignore line” context menu entry added in the debugger editor gutter when devtools.debugger.features.blackbox-lines is true. Also, there is a better “Ignore source” icon and editor background colors for ignored lines.
Auto-open devtools for tabs opened via window.open (behind devtools.popups.debug). On a page where you already have DevTools opened, if a new tab is created via window.open, the toolbox will automatically move to the new tab, with the new document selected in both the iframe picker and the context selector
WEB PLATFORM:
The HTML element already available on pre-release channels will become available on the release channel in version 98.
Form associated custom elements will become available on the release channel in version 98. This allows web authors to define and create custom elements that can be participated in form submission.
The hyphenate-character CSS property can be used to set a string that is used instead of a hyphen character (-) at the end of a hyphenation line break.
COMMUNITY CONTRIBUTIONS:
With the release of Firefox 98, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 5 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
Abhishek: Bug 1746631
Anastasios Bitha: Bug 1650197 and Bug 1751923
Hikota Nakatani: Bug 1751626
Kash: Bug 1752050 and Bug 1752567 and Bug 1753284
Lyubomir: Bug 1731050
Meg Viar: Bug 1751057
Rolf Martin Glomsrud: Bug 1739648
Shane Hughes: Bug 1718117 and Bug 1744366 and Bug 1747250

New in Firefox 97.0.2 (Mar 7, 2022)

New in Firefox 97.0.1 (Feb 17, 2022)

New in Firefox 97.0 (Feb 9, 2022)

New in Firefox 96.0.3 (Jan 31, 2022)

New in Firefox 96.0.2 (Jan 20, 2022)

New in Firefox 96.0.1 (Jan 14, 2022)

New in Firefox 96.0 (Jan 11, 2022)

New in Firefox 95.0.2 (Dec 20, 2021)

New in Firefox 95.0.1 (Dec 18, 2021)

New in Firefox 96.0 Beta 3 (Dec 10, 2021)

New in Firefox 96.0 Beta 2 (Dec 8, 2021)

New in Firefox 95.0 (Dec 7, 2021)

New in Firefox 94.0.2 (Nov 23, 2021)

New in Firefox 94.0.1 (Nov 15, 2021)

New in Firefox 94.0 (Nov 2, 2021)

NEW:
With 94, you’ll find a selection of six fun seasonal Colorways (available for a limited time only). Now you can find a color to suit (or lift) your every mood.
Fun fact: Did you know we have more daily users with color themes than dark or Alpenglow on Beta? With Firefox 89, 32% of users clicked through to customize their color theme. And that was just on the first day! We decided to introduce these new Colorways to give our users more to love.
Firefox macOS now uses Apple's low power mode for fullscreen video on YouTube and Twitch. This meaningfully extends battery life in long viewing sessions. Now your kids can find out what the fox says on a loop without you ever missing a beat…
With this release, power users can use about:unloads to release system resources by manually unloading tabs without closing them.
On Windows, there will now be fewer interruptions because Firefox won’t prompt you for updates. Instead, a background agent will download and install updates even if Firefox is closed.
To better protect all Firefox users against side-channel attacks such as Spectre, we’ve introduced Site Isolation. We’ve got your back...errr...side!
We’re rolling out the Firefox Multi-Account Containers extension with Mozilla VPN integration. This lets you use a different server location for each container.
Firefox no longer warns you by default when you exit the browser or close a window using a menu, button, or three-key command. This should cut back on unwelcome notifications which is always nice--however, if you prefer a bit of notice, you’ll still have full control over the quit/close modal behavior. All warnings can be managed within Firefox Settings. No worries! (More details)
And now, Firefox supports the new Snap Layouts menus when running on Windows 11.
FIXED:
We’ve reduced the overhead of using performance.mark() and performance.measure() APIs with a large set of performance entries.
Plus, we’ve modified paint suppression during load to greatly improve warmload performance in Site Isolation mode.
You’ll also notice a small reduction in Javascript memory usage.
With this release, you’ll notice faster Javascript property enumeration as well.
We’ve also implemented better scheduling of garbage collection which has improved some pageload benchmarks.
This release also sees reduced CPU usage during socket polling for HTTPS connections.
Additionally, you’ll notice faster storage initialization.
We’ve also improved cold startup by reducing main thread I/O.
Plus, closing devtools now reclaims more memory than ever before.
And we’ve improved pageload (especially with Site Isolation mode) by setting a higher priority for loading and displaying images.
Various security fixes
ENTERPRISE:
Enterprise users now have more control over Firefox deployments with the availability of our MSIX package on Windows platforms.
You’ll also notice various bug fixes and new policies have been implemented in this latest version of Firefox. See more details in the Firefox for Enterprise 94 Release Notes.
DEVELOPER:
Developer Information
Community Contributions:
With the release of Firefox 94, we would like to thank all the developers who contributed their first code change to Firefox in this release, 5 of whom were brand new volunteers! Please join us in thanking each of these diligent and enthusiastic individuals, and take a look at their contributions:
bvandersloot: Bug 1671182 - Remove "cache" feature from Clear-Site-Data
colin.cazabet: Bug 1619312 - Highlighting all occurrences of a selected token, Bug 1654257 - Images with incorrect mime-type won't appear when Network is filtered with "Images"
Ben: Bug 1656651 - Improve the management and reporting of the pausing of RSS feeds.
Hanna Jones: Bug 1723989 - Printing modal animation is displayed even when the show animation is switched off on Windows
Noah Pesta: Bug 1699593 - Remove default icon styles from info-pages.css .title class
Shaoting Huang: Bug 1712370 - Rename --panel-banner-item-warning-icon-bgcolor variable

New in Firefox 93.0 (Oct 7, 2021)

NEW:
Firefox now supports the new AVIF image format, which is based on the modern and royalty free AV1 video codec. It offers significant bandwidth savings for sites compared to existing image formats. It also supports transparency and other advanced features.
Firefox PDF viewer now supports filling more forms (XFA-based forms, used by multiple governments and banks). Learn more.
When available system memory is critically low, Firefox on Windows will automatically unload tabs based on their last access time, memory usage, and other attributes. This should help reduce Firefox out-of-memory crashes. Switching to an unloaded tab automatically reloads it.
To prevent session loss for macOS users who are running Firefox from a mounted .dmg file, they’ll now be prompted to finish installation. This permission prompt only appears the first time these users run Firefox on their computer.
Firefox now blocks downloads that rely on insecure connections, protecting against potentially malicious or unsafe downloads. Learn more and see where to find downloads in Firefox.
Improved web compatibility for privacy protections with SmartBlock 3.0. Learn more
Introducing a new referrer tracking protection in Strict Tracking Protection and Private Browsing. Learn more
Introducing Firefox Suggest, a faster way to navigate the web. Learn more about the experience and locale-specific features.
FIXED:
The VoiceOver screen reader now correctly reports checkable items in accessible tree controls as checked or unchecked.
The Orca screen reader now works correctly with Firefox, no longer requiring users to switch to another application after starting Firefox.
VARIOUS SECURITY FIXES:
CHANGED:
TLS ciphersuites that use 3DES have been disabled. Such ciphersuites can only be enabled when deprecated versions of TLS are also enabled. Learn more.
The download panel now follows the Firefox visual styles.
ENTERPRISE:
Various bug fixes and new policies have been implemented in the latest version of Firefox. See more details in the Firefox for Enterprise 93 Release Notes.
WEB PLATFORM:
The UI for has been implemented.

New in Firefox 91.0.2 (Aug 24, 2021)

New in Firefox 91.0.1 (Aug 17, 2021)

New in Firefox 92.0 Beta 2 (Aug 11, 2021)

New in Firefox 91.0 (Aug 10, 2021)

New in Firefox 90.0.2 (Jul 22, 2021)

New in Firefox 90.0.1 (Jul 19, 2021)

New in Firefox 90.0 (Jul 13, 2021)

New in Firefox 89.0.2 (Jun 23, 2021)

New in Firefox 89.0.1 (Jun 16, 2021)

New in Firefox 89.0 (Jun 1, 2021)

New:
Say hello to a fresh new Firefox, designed to get you where you want to go even faster. We’ve redesigned and modernized the core experience to be cleaner, more inviting, and easier to use.
Beginning in 89, you’ll notice a number of changes, including:
Simplified browser chrome and toolbar: Less frequently used items removed to focus on the most important navigation items.
Clear, streamlined menus: Re-organized and prioritized menu content according to usage. Updated labels and removed iconography.
Updated prompts: Infobars, panels, and modals have a cleaner design and clearer language.
Inspired tab design: Floating tabs neatly contain information and surface cues when you need them, like visual indicators for audio controls. The rounded design of the active tab supports focus and signals the ability to easily move the tab as needed.
Fewer interruptions: Reduced number of alerts and messages, so you can browse with fewer distractions.
Cohesive, calmer visuals: Lighter iconography, a refined color palette, and more consistent styling throughout.
This release also includes enhancements to our privacy offerings:
We’ve enhanced the privacy of the Firefox Browser’s Private Browsing mode with Total Cookie Protection, which confines cookies to the site where they were created, preventing companies from using cookies to track your browsing across sites. This feature was originally launched in Firefox’s ETP Strict mode.
macOS:
For macOS users, we're introducing the elastic overscroll effect known from many other applications. A gentle bouncing animation will indicate that you reached the end of the page.
In addition, we added support for smart zoom. Double-tap with two fingers on your trackpad, or with a single finger on your Magic Mouse, to zoom the content below your cursor into focus.
Native context menus: Context menus on macOS are now native and support Dark Mode.
Fixed:
Colors in Firefox on macOS will no longer be saturated on wide gamut displays, untagged images are properly treated as sRGB, and colors in images tagged as sRGB will now match CSS colors.
In full screen mode on macOS, moving your mouse to the top of the screen will no longer hide your tabs behind the system menu bar.
Also in full screen mode on macOS, it is now possible to hide the browser toolbars for a fully immersive full screen experience. This brings macOS in line with Windows and Linux.
Various stability and security fixes.
Changed:
Introducing a non-native implementation of web form controls, which delivers a new modern design and some improvements to page load performance. Watch for layout bugs in web pages that make assumptions about the dimensions or styling of form controls.
The screenshots feature is available in the right-click context menu. You can also add a screenshots shortcut to your toolbar.
Developer:
Better keyboard navigation for editable BoxModel properties in the Inspector panel
Web Platform:
The Event Timing API is now supported.
The CSS forced-colors media query is now supported.

New in Firefox 88.0.1 (May 6, 2021)

New in Firefox 88.0 (Apr 19, 2021)

New in Firefox 87.0 (Mar 23, 2021)

New:
You’ll encounter less website breakage in Private Browsing and Strict Enhanced Tracking Protection with SmartBlock, which provides stand-in scripts so that websites load properly.
To further protect your privacy, our new default HTTP Referrer policy will trim path and query string information from referrer headers to prevent sites from accidentally leaking sensitive user data.
The “Highlight All” feature on Find in Page now displays tick marks alongside your scrollbar that correspond to the location of matches found on that page.
We’re proud to announce full support for macOS built-in screen reader, VoiceOver.
We’ve added a new locale: Silesian (szl)
Fixed:
We’ve fixed several significant accessibility issues
Video controls now have visible focus styling and video and audio controls are now keyboard navigable. (Bug 1681007)
HTML is now spoken by screen readers. (Bug 1460378)
Firefox now sets a useful initial focus in Add-ons Manager. (Bug 580537)
Firefox will now fire a name/description change event when aria-labelledby/describedby content changes. (Bug 493683)
Various security fixes.
Changed:
To prevent user data loss when filling out forms, we’ve disabled the Backspace key as a navigation shortcut for the back navigation button. To re-enable the Backspace keyboard shortcut, you can change the about:config preference browser.backspace_action to 0. You can also use the recommended Alt + Left arrow (Command + Left arrow on Mac) shortcut instead.
Firefox keyboard shortcuts
We've removed items from the Library menu that weren't used often or have other access points in the browser: Synced tabs, Recent highlights, and Pocket list.
We've simplified the Help menu by reducing redundant items, such as those that point to Firefox support pages that can also be accessed via the Get Help item.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox.
Developer:
We've greatly simplified the Web Developer menu. Go to Application Menu > Web Developer > Web Developer Tools to access Inspector, Web Console, Debugger, Network Style Error, Performance, Storage Inspector, Accessibility, and Application
Developers can now use the Page Inspector to simulate prefers-color-scheme media queries, without having to change the operating system to light or dark mode.
Developers can now use the Page Inspector to toggle the :target pseudo-class for the currently selected element in addition to the pseudo-classes that were previously supported: :hover, :active and :focus, :focus-within, :focus-visible, and :visited.
There is a number of Page Inspector improvements and bug fixes related to inactive CSS rules:
The table-layout property is now marked as inactive for non-table elements.
The scroll-padding properties (shorthand and longhand) are now marked as inactive for non-scrollable elements.
The text-overflow property was previously incorrectly marked as inactive for some overflow values.

New in Firefox 86.0.1 (Mar 11, 2021)

New in Firefox 86.0 (Feb 23, 2021)

New in Firefox 85.0.2 (Feb 9, 2021)

New in Firefox 85.0.1 (Feb 5, 2021)

New in Firefox 85.0 (Jan 26, 2021)

New in Firefox 84.0.2 (Jan 6, 2021)

New in Firefox 84.0.1 (Dec 23, 2020)

New in Firefox 84.0 (Dec 15, 2020)

New in Firefox 83.0 (Nov 17, 2020)

New:
Firefox keeps getting faster as a result of significant updates to SpiderMonkey, our JavaScript engine, you will now experience improved page load performance by up to 15%, page responsiveness by up to 12%, and reduced memory usage by up to 8%. We have replaced part of the JavaScript engine that helps to compile and display websites for you, improving security and maintainability of the engine at the same time.
Firefox introduces HTTPS-Only Mode. When enabled, this new mode ensures that every connection Firefox makes to the web is secure and alerts you when a secure connection is not available. You can enable it in Firefox Preferences.
Pinch zooming will now be supported for our users with Windows touchscreen devices and touchpads on Mac devices. Firefox users may now use pinch to zoom on touch-capable devices to zoom in and out of webpages.
Picture-in-Picture now supports keyboard shortcuts for fast forwarding and rewinding videos: use the arrow keys to move forward and back 15 seconds, along with volume controls. For a list of supported commands see Support Mozilla
When you are presenting your screen on a video conference in Firefox, you will see our improved user interface that makes it clearer which devices or displays are being shared.
Firefox supports AcroForm, which will allow you to fill in, print, and save supported PDF forms and the PDF viewer also has a new fresh look.
Our users in India on the English build of Firefox will now see Pocket recommendations in their new tab featuring some of the best stories on the web. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps.
For the recently released Apple devices built with Apple Silicon CPUs, you can use Firefox 83 and future releases without any change. This release (83) will support emulation under Apple’s Rosetta 2 that ships with macOS Big Sur. We are working toward Firefox being natively-compiled for these CPUs in a future release.
This is a major release for WebRender as we roll out to more Firefox users on Windows 7 and 8 as well as on macOS 10.12 to 10.15.
We’ve improved functionality and design for a number of Firefox search features:
Selecting a search engine at the bottom of the search panel now enters search mode for that engine, allowing you to see suggestions (if available) for your search terms. The old behavior (immediately performing a search) is available with a shift-click.
When Firefox autocompletes the URL of one of your search engines, you can now search with that engine directly in the address bar by selecting the shortcut in the address bar results.
We’ve added buttons at the bottom of the search panel to allow you to search your bookmarks, open tabs, and history.
Fixed:
For users on macOS restoring a session with minimized windows, Firefox now uses much less power and you should see much longer battery life.
Various security fixes
This release also includes a number of accessibility fixes:
Screen reader features which report paragraphs now correctly report paragraphs instead of lines in Google Docs
When reading by word using a screen reader, words are now correctly reported when there is punctuation nearby
The arrow keys now work correctly after tabbing in the picture-in-picture window
Developer:
Developers can use the scroll badge in the Page Inspector to Debug scrollable overflow. Selecting the badge highlights elements that are causing overflow and marks them with the overflow badge
Web Platform:
This release adds support for conic gradients in CSS, helping colors to smoothly transition as you spin around the center, rather than as you progress outward from the center.

New in Firefox 82.0.3 (Nov 9, 2020)

New in Firefox 82.0.2 (Oct 31, 2020)

New in Firefox 82.0 (Oct 20, 2020)

New in Firefox 81.0.2 (Oct 13, 2020)

New in Firefox 81.0.1 (Oct 1, 2020)

New in Firefox 81.0 (Sep 22, 2020)

New:
You can pause and play audio or video in Firefox right from your keyboard or headset, giving you easy access to control your media when in another Firefox tab, another program, or even when your computer is locked.
In addition to our default, dark and light themes, with this release, Firefox introduces the Alpenglow theme: a colorful appearance for buttons, menus, and windows. You can update your Firefox themes under settings or preferences.
For our users in the US and Canada, Firefox can now save, manage, and auto-fill credit card information for you, making shopping on Firefox ever more convenient. To ensure the smoothest experience, this will be rolling out to users gradually.
Firefox supports AcroForm, which will soon allow you to fill in, print, and save supported PDF forms and the PDF viewer also has a new fresh look.
Our 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. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps. In addition to Firefox’s new tab, Pocket is also available as an app on iOS and Android.
Fixed:
Various security fixes.
We’ve 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.
Changed:
You will soon find Picture-in-Picture more easily on all the videos you watch with new iconography.
The bookmarks toolbar is now automatically revealed once bookmarks are imported into Firefox, making it easier to find your most important websites.
We have expanded our supported file types - .xml, .svg, and .webp - so files you’ve downloaded can be opened right in Firefox.
Enterprise:
Various bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 81 Release Notes.
Developer:
TypeScript files are now properly identified in the Debugger panel and labeled with corresponding icons making it easier for you to find these files in the list.
HTTP JSON responses using XSSI prevention characters are properly parsed and JSON data presented in a form of an expandable tree. This allows easy inspection of such HTTP responses through traditional (expandable) tree UI.
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. We removed protanomaly, deuteranomaly and tritanomaly and aded achromatopsia.

New in Firefox 80.0.1 (Sep 1, 2020)

New in Firefox 80.0 (Aug 30, 2020)

New:
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.
Fixed:
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.
Changed:
For users with reduced motion settings, we’ve reduced a number of animations such as tab loading to reduce motion for users with migraines and epilepsy.
The new add-ons blocklist has been enabled to improve performance and scalability.
Enterprise:
A number of bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 80 Release Notes.
Today’s release is the final scheduled for Firefox 68 ESR (68.12) unless there is a critical security issue found prior to the release of Firefox ESR 78.3 on September 22, 2020. Users of Firefox 68 ESR will be automatically upgraded to the Firefox 78 ESR series with the release of 78.3.
Developer:
We’ve shipped 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. These features also provide better compatibility with many websites using WebRTC.

New in Firefox 79.0 (Jul 28, 2020)

New:
We’ve rolled out WebRender to more Windows users with Intel and AMD GPUs, bringing improved graphics performance to an even larger audience.
Firefox users in Germany will now see more Pocket recommendations in their new tab featuring some of the best stories on the web. If you don’t see them, you can turn on Pocket articles in your new tab by following these steps.
Fixed:
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.
Enterprise:
A number of bug fixes and new policies have been implemented in the latest version of Firefox. You can see more details in the Firefox for Enterprise 79 Release Notes.
Updates to the password policy allow admins to require a primary password (formerly called master password. Previously the policy could disable the primary password but not force a primary password. Users required to use a primary password will only be asked to create a primary password the first time they try to save a password.
Developer:
Newly added asynchronous call stacks let developers trace their async code through events, timeouts, and promises. The async execution chains are shown in the Debugger’s call stack, but also for stack traces in Console errors and Network initiators.
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. The request/response details can be expanded or resent for quick debugging.
JavaScript errors are now visible not only in the Console, but also in the Debugger. The relevant line of code will be highlighted and display error details on hover.
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.

New in Firefox 78.0.2 (Jul 10, 2020)

New in Firefox 78.0.1 (Jul 2, 2020)

New in Firefox 78.0 (Jun 30, 2020)

New:
The Protections Dashboard includes consolidated reports about tracking protection, data breaches, and password management.
New features let you: Track how many breaches you’ve resolved right from the dashboard. See if any of your saved passwords may have been exposed in a data breach
To view your dashboard, type about:protections into the address bar, or select “Protections Dashboard” from the main menu.
Because we know people try to fix problems by reinstalling Firefox when a simple refresh is more likely to solve the issue, we’ve added a Refresh button to the Uninstaller.
With this release, your screen saver will no longer interrupt WebRTC calls on Firefox, making conference and video calling in Firefox better.
We’ve rolled out WebRender to Windows users with Intel GPUs, bringing improved graphics performance to an even larger audience.
Firefox 78 is also our Extended Support Release (ESR), where the changes made over the course of the previous 10 releases will now roll out to our ESR users. Some of the highlights are:
Kiosk mode
Client certificates
Service Worker and Push APIs are now enabled
The Block Autoplay feature is enabled
Picture-in-picture support
View and manage web certificates in about:certificate
Pocket recommendations, featuring some of the best stories on the web, will now appear on the Firefox new tab for 100% of our users in the UK. If you don’t see them, you can turn on Pocket articles in your new tab, follow these steps.
Fixed:
Various security fixes.
We fixed bugs in the search results quality composition and improved search result texts based on recommendations by our partners.
Changed:
The minimal system requirements on Linux have been updated. Firefox now needs GNU libc 2.17, libstdc++ 4.8.1 and GTK+ 3.14 or newer versions.
As part of our ongoing effort to deprecate obsolete cryptography, we have disabled all remaining DHE-based TLS ciphersuites by default.
To mitigate web compatibility issues from disabling DHE-based TLS ciphersuites, Firefox 78 enables two more AES-GCM SHA2-based ciphersuites.
We have disabled TLS 1.0 and TLS 1.1 to improve your website connections. Sites that don't support TLS version 1.2 will now show an error page.
The context menu (accessed by right clicking on a tab) 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.
We reduced a number of animations such as tab hover, search bar expansion, and others to reduce motion for users with migraines and epilepsy.
Enterprise:
Enable 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.
Developer:
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, which makes debugger of source-mapped projects feel more seamless.
The Firefox DevTools’ Network panel now highlights which extension or CORS restriction blocked a request, so developers can make their sites more resilient and secure.
New RegExp engine in SpiderMonkey, adding support for the dotAll flag, Unicode escape sequences, lookbehind references, and named captures.

New in Firefox 77.0.1 (Jun 30, 2020)

New in Firefox 77.0 (Jun 30, 2020)

New in Firefox 76.0.1 (Jun 30, 2020)

New in Firefox 76.0 (Jun 30, 2020)

New in Firefox 75.0 (Jun 30, 2020)

New in Firefox 74.0 (Jun 30, 2020)

New in Firefox 73.0.1 (Feb 19, 2020)

New in Firefox 72.0.2 (Jan 20, 2020)

New in Firefox 72.0 (Jan 6, 2020)

New in Firefox 71.0 (Dec 3, 2019)

New in Firefox 69.0.2 (Oct 3, 2019)

New in Firefox 69.0.1 (Sep 18, 2019)

New in Firefox 69.0 (Sep 2, 2019)

New in Firefox 68.0.2 (Aug 16, 2019)

New in Firefox 68.0.1 (Jul 24, 2019)

New in Firefox 68.0 (Jul 12, 2019)

New:
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. "Recommended” badges for these extensions also appear on AMO. More extensions will be added over time.
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.
Fixed:
Various security fixes
Local files can no longer access other files in the same directory.
Changed:
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). Existing users will be migrated to the British English (en-GB) version.
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.
Enterprise:
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

New in Firefox 67.0.3 (Jun 19, 2019)

New in Firefox 66.0.5 (May 8, 2019)

New in Firefox 66.0.4 (May 5, 2019)

New in Firefox 66.0.2 (Mar 31, 2019)

New in Firefox 66.0.1 (Mar 23, 2019)

New in Firefox 65.0.1 (Feb 13, 2019)

New in Firefox 65.0 (Jan 28, 2019)

New in Firefox 64.0.2 (Jan 9, 2019)

New in Firefox 64.0 (Dec 12, 2018)

New:
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). (Clang LTO was enabled for Windows users in Firefox 63.)
More seamless sharing on Windows: Windows users can now share web pages using the native sharing experience. You can access Share in the Page Actions menu
Added option to remove add-ons using the context menu on their toolbar buttons
New for enterprise users: Updated the policy engine on macOS to allow using configuration profiles to customize Firefox for enterprise deployments
Fixed:
Various security fixes
Changed:
RSS feed preview and live bookmarks are available only via add-ons
TLS certificates issued by Symantec are no longer trusted by Firefox. Website operators are strongly encouraged to replace any remaining Symantec TLS certificates as soon as possible.
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
Developer:
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

New in Firefox 63.0.3 (Nov 22, 2018)

New in Firefox 63.0 (Oct 22, 2018)

New in Firefox 62.0.3 (Oct 2, 2018)

New in Firefox 61.0.2 (Aug 9, 2018)

New in Firefox 61.0.1 (Jul 6, 2018)

New in Firefox 60.0.1 (May 16, 2018)

New in Firefox 59.0.3 (Apr 30, 2018)

New in Firefox 59.0.2 (Mar 26, 2018)

New in Firefox 59.0 (Mar 13, 2018)

New in Firefox 58.0.2 (Feb 8, 2018)

New in Firefox 58.0 (Jan 20, 2018)

New in Firefox 57.0.4 (Jan 5, 2018)

New in Firefox 57.0.3 (Dec 29, 2017)

New in Firefox 57.0.2 (Dec 8, 2017)

New in Firefox 57.0.1 (Nov 30, 2017)

New in Firefox 57.0 (Nov 13, 2017)

New in Firefox 56.0 (Sep 28, 2017)

New in Firefox 55.0.3 (Sep 4, 2017)

New in Firefox 55.0.2 (Aug 16, 2017)

New in Firefox 55.0.1 (Aug 12, 2017)

New in Firefox 55.0 (Aug 7, 2017)

New in Firefox 54.0.1 (Jun 30, 2017)

New in Firefox 54.0 (Jun 13, 2017)

New in Firefox 53.0.3 (May 19, 2017)

New in Firefox 53.0.2 (May 5, 2017)

New in Firefox 53.0 (Apr 19, 2017)

New in Firefox 52.0.2 ESR (Mar 28, 2017)

New in Firefox 52.0 ESR (Mar 7, 2017)

New in Firefox 51.0.1 (Jan 27, 2017)

New in Firefox 51.0 (Jan 23, 2017)

New in Firefox 50.0.2 (Dec 1, 2016)

New in Firefox 50.0.1 (Nov 29, 2016)

New in Firefox 51.0 Beta 1 (Nov 17, 2016)

New in Firefox 50.0 (Nov 14, 2016)

New in Firefox 49.0.1 (Sep 26, 2016)

New in Firefox 49.0 (Sep 19, 2016)

New in Firefox 48.0.2 (Aug 24, 2016)

New in Firefox 48.0.1 (Aug 22, 2016)

New in Firefox 49.0 Beta 1 (Aug 3, 2016)

New in Firefox 48.0 (Aug 2, 2016)

New:
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
GNU/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 GNU/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
Windows folks: Tab (move buttons) and Shift+F10 (pop-up menus) now behave as they should in Firefox customization mode
The media parser has been redeveloped using the Rust programming language
Fixed:
Heyo, Jabra & Logitech C920 webcam users. We fixed those pesky WebRTC bugs causing frequency distortions. Buh-bye, squeaky voice!
Improved step debugging on last line of functions
Changed:
So long to support for 10.6, 10.7 and 10.8. Now we can focus on where most Mac users are: 10.9. Don't forget to upgrade!
After version 48, SSE2 CPU extensions are going to be required on Windows
Au revoir to Windows Remote Access Service modem Autodial
Developer:
WebExtensions support is now considered as stable
Want to move absolute & fixed positioned elements? (Who doesn't, right?) Now you can with our geometry editor.
The memory tool now has a tree map view for your debugging pleasure. It's a little bit of "boo" and a whole lot of "ya."
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. (Who's down with CSP?)
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.
Expand 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

New in Firefox 47.0.1 (Jun 28, 2016)

New in Firefox 47.0 (Jun 6, 2016)

New in Firefox 47.0 Beta 1 (Apr 28, 2016)

New in Firefox 46.0 (Apr 26, 2016)

New in Firefox 45.0.1 (Mar 17, 2016)

New in Firefox 46.0 Beta 1 (Mar 12, 2016)

New in Firefox 45.0 (Mar 8, 2016)

New in Firefox 44.0.2 (Feb 11, 2016)

New in Firefox 45.0 Beta 4 (Feb 10, 2016)

New in Firefox 44.0.1 (Feb 9, 2016)

New in Firefox 45.0 Beta 3 (Feb 8, 2016)

New in Firefox 45.0 Beta 1 (Feb 1, 2016)

New in Firefox 44.0 (Jan 26, 2016)

New in Firefox 43.0.4 (Jan 7, 2016)

New in Firefox 43.0.3 (Dec 30, 2015)

New in Firefox 44.0 Beta 1 (Dec 18, 2015)

New in Firefox 43.0 (Dec 14, 2015)

New in Firefox 43.0 Beta 3 (Nov 16, 2015)

New in Firefox 43.0 Beta 1 (Nov 9, 2015)

New in Firefox 42.0 (Nov 2, 2015)

New in Firefox 41.0.2 (Oct 15, 2015)

New in Firefox 42.0 Beta 1 (Sep 24, 2015)

New in Firefox 41.0 (Sep 22, 2015)

New in Firefox 40.0.3 (Aug 27, 2015)

New in Firefox 40.0.2 (Aug 16, 2015)

New in Firefox 41.0 Beta (Aug 12, 2015)

New in Firefox 40.0 (Aug 11, 2015)

New in Firefox 39.0.3 (Aug 6, 2015)

New in Firefox 40.0 Beta 9 (Aug 1, 2015)

New in Firefox 40.0 Beta 8 (Jul 28, 2015)

New in Firefox 40.0 Beta 7 (Jul 25, 2015)

New in Firefox 40.0 Beta 6 (Jul 22, 2015)

New in Firefox 40.0 Beta 4 (Jul 16, 2015)

New in Firefox 40.0 Beta 3 (Jul 13, 2015)

New in Firefox 40.0 Beta 1 (Jul 6, 2015)

New in Firefox 39.0 (Jul 3, 2015)

New in Firefox 39.0 Beta 7 (Jun 21, 2015)

New in Firefox 39.0 Beta 5 (Jun 13, 2015)

New in Firefox 38.0.5 (Jun 2, 2015)

New in Firefox 39.0 Beta 1 (May 29, 2015)

New in Firefox 38.0.1 (May 14, 2015)

New in Firefox 38.0.5 Beta (May 14, 2015)

New in Firefox 38.0 (May 12, 2015)

New in Firefox 38.0 Beta 9 (Apr 30, 2015)

New in Firefox 38.0 Beta 8 (Apr 29, 2015)

New in Firefox 38.0 Beta 7 (Apr 27, 2015)

New in Firefox 38.0 Beta 6 (Apr 23, 2015)

New in Firefox 37.0.2 (Apr 20, 2015)

New in Firefox 38.0 Beta 5 (Apr 17, 2015)

New in Firefox 38.0 Beta 2 (Apr 7, 2015)

New in Firefox 37.0.1 (Apr 3, 2015)

New in Firefox 38.0 Beta 1 (Apr 2, 2015)

New in Firefox 37.0 (Mar 31, 2015)

New in Firefox 36.0.4 (Mar 21, 2015)

New in Firefox 36.0.3 (Mar 21, 2015)

New in Firefox 37.0 Beta 5 (Mar 13, 2015)

New in Firefox 36.0.1 (Mar 6, 2015)

New in Firefox 37.0 Beta 1 (Feb 24, 2015)

New in Firefox 36.0 (Feb 24, 2015)

New in Firefox 36.0 Beta 10 (Feb 20, 2015)

New in Firefox 36.0 Beta 9 (Feb 14, 2015)

New in Firefox 36.0 Beta 8 (Feb 10, 2015)

New in Firefox 36.0 Beta 7 (Feb 6, 2015)

New in Firefox 36.0 Beta 6 (Feb 3, 2015)

New in Firefox 36.0 Beta 5 (Jan 31, 2015)

New in Firefox 36.0 Beta 4 (Jan 27, 2015)

New in Firefox 35.0.1 (Jan 26, 2015)

New in Firefox 36.0 Beta 3 (Jan 24, 2015)

New in Firefox 36.0 Beta 2 (Jan 21, 2015)

New in Firefox 36.0 Beta 1 (Jan 16, 2015)

New in Firefox 35.0 (Jan 13, 2015)

New in Firefox 35.0 RC1 (Jan 6, 2015)

New in Firefox 35.0 Beta 8 (Dec 31, 2014)

New in Firefox 35.0 Beta 6 (Dec 24, 2014)

New in Firefox 35.0 Beta 5 (Dec 19, 2014)

New in Firefox 35.0 Beta 4 (Dec 17, 2014)

New in Firefox 35.0 Beta 3 (Dec 12, 2014)

New in Firefox 35.0 Beta 2 (Dec 10, 2014)

New in Firefox 34.0.5 (Dec 1, 2014)

New in Firefox 34.0 RC2 (Nov 26, 2014)

New in Firefox 34.0 RC1 (Nov 25, 2014)

New in Firefox 34.0 Beta 10 (Nov 19, 2014)

New in Firefox 33.1.1 (Nov 15, 2014)

New in Firefox 33.1.0 (Nov 15, 2014)

New in Firefox 34.0 Beta 9 (Nov 14, 2014)

New in Firefox 34.0 Beta 8 (Nov 11, 2014)

New in Firefox 34.0 Beta 7 (Nov 7, 2014)

New in Firefox 33.0.3 (Nov 7, 2014)

New in Firefox 34.0 Beta 6 (Nov 4, 2014)

New in Firefox 34.0 Beta 5 (Nov 1, 2014)

New in Firefox 33.0.2 (Oct 28, 2014)

New in Firefox 34.0 Beta 4 (Oct 28, 2014)

New in Firefox 33.0.1 (Oct 24, 2014)

New in Firefox 34.0 Beta 3 (Oct 24, 2014)

New in Firefox 34.0 Beta 1 (Oct 17, 2014)

New in Firefox 33.0 (Oct 14, 2014)

New in Firefox 33.0 Beta 8 (Oct 1, 2014)

New in Firefox 32.0.3 (Sep 25, 2014)

New in Firefox 33.0 Beta 6 (Sep 23, 2014)

New in Firefox 33.0 Beta 5 (Sep 19, 2014)

New in Firefox 33.0 Beta 4 (Sep 16, 2014)

New in Firefox 32.0.1 (Sep 13, 2014)

New in Firefox 33.0 Beta 3 (Sep 12, 2014)

New in Firefox 33.0 Beta 2 (Sep 9, 2014)

New in Firefox 32.0 (Sep 1, 2014)

New in Firefox 32.0 Beta 2 (Jul 29, 2014)

New in Firefox 32 Beta 1 (Jul 28, 2014)

New in Firefox 31.0 (Jul 21, 2014)

New in Firefox 30.0 (Jun 10, 2014)

New in Firefox 30.0 RC1 (Jun 4, 2014)

New in Firefox 29.0 (Apr 28, 2014)

New in Firefox 29.0 Beta 5 (Apr 4, 2014)

New in Firefox 29.0 Beta 2 (Mar 25, 2014)

New in Firefox 28.0 (Mar 18, 2014)

New in Firefox 28 Beta 4 (Feb 19, 2014)

New in Firefox 27.0.1 (Feb 14, 2014)

New in Firefox 27.0 (Feb 4, 2014)

New in Firefox 26.0 (Dec 10, 2013)

New in Firefox 25.0 (Oct 31, 2013)

New in Firefox 24.0 (Sep 16, 2013)

New in Firefox 24.0 Beta 2 (Aug 14, 2013)

New in Firefox 23.0 (Aug 6, 2013)

New in Firefox 22.0 (Jun 25, 2013)

New in Firefox 22.0 Beta 6 (Jun 18, 2013)

New in Firefox 22.0 Beta 3 (May 29, 2013)

New in Firefox 22.0 Beta 2 (May 23, 2013)

New in Firefox 22.0 Beta 1 (May 17, 2013)

New in Firefox 21.0 (May 14, 2013)

New in Firefox 22.0 Alpha 2 (Apr 9, 2013)

New in Firefox 20.0 (Apr 2, 2013)

New in Firefox 20.0 Beta 6 (Mar 21, 2013)

New in Firefox 20.0 Beta 1 (Feb 23, 2013)

New in Firefox 19.0 (Feb 19, 2013)

New in Firefox 18.0.1 (Jan 19, 2013)

New in Firefox 19.0 Beta 1 (Jan 11, 2013)

New in Firefox 18.0 (Jan 8, 2013)

New in Firefox 17.0 ESR (Nov 20, 2012)

New in Firefox 16.0 (Oct 9, 2012)

New in Firefox 15.0 (Aug 28, 2012)

New in Firefox 14.0.1 (Jul 17, 2012)

New in Firefox 13.0 (Jun 2, 2012)

New in Firefox 13 Beta 3 (May 11, 2012)

New in Firefox 12.0 (Apr 22, 2012)

New in Firefox 12.0 Beta 1 (Mar 17, 2012)

New in Firefox 11.0 (Mar 13, 2012)

New in Firefox 11.0 Beta 1 (Feb 6, 2012)

New in Firefox 10.0 (Jan 31, 2012)

New in Firefox 10.0 Beta 1 (Dec 23, 2011)

New in Firefox 8.0 (Nov 6, 2011)

New in Firefox 7.0 (Sep 27, 2011)

New in Firefox 6.0 Beta 1 (Jul 11, 2011)

New in Firefox 4.0 RC2 (Mar 21, 2011)

New in Firefox 4.0 RC1 (Mar 10, 2011)

New in Firefox 4.0 Beta 12 (Feb 28, 2011)

New in Firefox 4.0 Beta 11 (Feb 8, 2011)

New in Firefox 4.0 Beta 6 (Sep 15, 2010)

Fixed a stability issue affecting Windows users.
Fixed an issue causing rendering errors with plugins
affecting Mac OS X users. See the complete changelist from the previous beta.
As well as these features from previous Firefox 4 Betas:
Firefox 4 Beta is available in 39 languages.
Support for the new proposed Audio Data API
Direct2D Hardware Acceleration is now on by default for Windows 7 users
Firefox button has a new look for Windows Vista and Windows 7 users
Support for HSTS security protocol allowing sites to insist that they only be loaded over SSL.
Firefox Sync is now included by default.
A new feature gives users a visual overview of all open tabs, allowing them to be sorted and grouped.
An experimental API is included to provide more efficient Javascript animations.
Firefox now supports the HTML5 video "buffered" property.
Tabs are now on top by default on Windows and OSX - Linux will be changing when the theme has been modified to support the change.
You can turn any tab into an "App Tab" by right-clicking on it and selecting "Make into App Tab" from the context menu.
Web developers can animate content using CSS Transitions.
Responsiveness and scrolling improvements from the new retained layers layout system.
JavaScript speed improvements due to engine optimizations.
Changes to how XPCOM components are registered in order to help startup time and process separation.
You can search for and switch to already open tabs in the Smart Location Bar.
New Addons Manager and extension management API (UI will be changed before final release).
Significant API improvements are available for JS-ctypes, a foreign function interface for extensions.
The stop and reload buttons have been merged into a single button on Windows, Mac and Linux.
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
Crash protection for Windows, Linux, and Mac when there is a crash in the Adobe Flash, Apple Quicktime or Microsoft Silverlight plugins.
CSS Transitions are partially supported.
Full WebGL support is included but disabled by default at this time.
Core Animation rendering model for plugins on Mac OS X. Plugins which also support this rendering model can now draw faster and more efficiently.
Native support for the HD HTML5 WebM video format.
An experimental Direct2D rendering backend is available on Windows, turned off by default.
Web developers can use Websockets for a low complexity, low latency, bidirectional communications API.
Web developers can update the URL field without reloading the page using HTML History APIs.
More responsive page rendering using lazy frame construction.
Link history lookup is done asynchronously to provide better responsiveness during pageload.
CSS :visited selectors have been changed to block websites from being able to check a user's browsing history.
New HTML5 parser.
Support for more HTML5 form controls.
Web authors can now get touch events from Firefox users on Windows 7 machines.
A new way of representing values in JavaScript that allows Firefox to execute heavy, numeric code (used for things like graphics and animations) more efficiently.

New in Firefox 3.6.9 (Sep 8, 2010)

New in Firefox 3.6.4 (Jun 22, 2010)

New in Firefox 3.6.4 Beta Build 1 (Apr 21, 2010)

New in Firefox 3.6.3 (Apr 2, 2010)

New in Firefox 3.6.2 (Mar 23, 2010)

New in Firefox 3.7 Alpha 2 (Mar 3, 2010)

New in Firefox 3.6 Beta 2 (Nov 11, 2009)

New in Firefox 3.5.2 (Aug 3, 2009)

New in Firefox 3.5.2 Beta (Aug 3, 2009)

New in Firefox 3.5.1 (Jul 17, 2009)

New in Firefox 3.0.10 (Apr 28, 2009)

New in Firefox 3.5 Beta 4 (Apr 28, 2009)

New in Firefox 3.0.9 (Apr 21, 2009)

New in Firefox 3.0.7 (Mar 5, 2009)

New in Firefox 3.0.4 (Nov 12, 2008)

New in Firefox 3.0.1 (Sep 8, 2008)

More Secure
One-click site info: Click the site favicon in the location bar to see who owns the site and to check if your connection is protected from eavesdropping. Identity verification is prominently displayed and easier to understand. When a site uses Extended Validation (EV) SSL certificates, the site favicon button will turn green and show the name of the company you're connected to. (Try it here!)
Malware Protection: malware protection warns users when they arrive at sites which are known to install viruses, spyware, trojans or other malware. (Try it here!)
New Web Forgery Protection page: the content of pages suspected as web forgeries is no longer shown. (Try it here!)
New SSL error pages: clearer and stricter error pages are used when Firefox encounters an invalid SSL certificate. (Try it here!)
Add-ons and Plugin version check: Firefox now automatically checks add-on and plugin versions and will disable older, insecure versions.
Secure add-on updates: to improve add-on update security, add-ons that provide updates in an insecure manner will be disabled.
Anti-virus integration: Firefox will inform anti-virus software when downloading executables.
Vista Parental Controls: Firefox now respects the Vista system-wide parental control setting for disabling file downloads.
Effective top-level domain (eTLD) service better restricts cookies and other restricted content to a single domain.
Better protection against cross-site JSON data leaks.
Easier to Use
Easier password management: an information bar replaces the old password dialog so you can now save passwords after a successful login.
Simplified add-on installation: the add-ons whitelist has been removed making it possible to install extensions from third-party sites in fewer clicks.
New Download Manager: the revised download manager makes it much easier to locate downloaded files, and you can see and search on the name of the website where a file came from. Your active downloads and time remaining are always shown in the status bar as your files download.
Resumable downloading: users can now resume downloads after restarting the browser or resetting your network connection.
Full page zoom: from the View menu and via keyboard shortcuts, the new zooming feature lets you zoom in and out of entire pages, scaling the layout, text and images, or optionally only the text size. Your settings will be remembered whenever you return to the site.
Podcasts and Videocasts can be associated with your media playback tools.
Tab scrolling and quickmenu: tabs are easier to locate with the new tab scrolling and tab quickmenu.
Save what you were doing: Firefox will prompt users to save tabs on exit.
Optimized Open in Tabs behavior: opening a folder of bookmarks in tabs now appends the new tabs rather than overwriting.
Location and Search bar size can now be customized with a simple resizer item.
Text selection improvements: multiple text selections can be made with Ctrl/Cmd; double-click drag selects in "word-by-word" mode; triple-clicking selects a paragraph.
Find toolbar: the Find toolbar now opens with the current selection.
Plugin management: users can disable individual plugins in the Add-on Manager.
Integration with Windows: Firefox now has improved Windows icons, and uses native user interface widgets in the browser and in web forms.
Integration with the Mac: the new Firefox theme makes toolbars, icons, and other user interface elements look like a native OS X application. Firefox also uses OS X widgets and supports Growl for notifications of completed downloads and available updates. A combined back and forward control make it even easier to move between web pages.
Integration with Linux: Firefox's default icons, buttons, and menu styles now use the native GTK theme.
More Personal
Star button: quickly add bookmarks from the location bar with a single click; a second click lets you file and tag them.
Tags: associate keywords with your bookmarks to sort them by topic.
Location bar & auto-complete: type in all or part of the title, tag or address of a page to see a list of matches from your history and bookmarks; a new display makes it easier to scan through the matching results and find that page you're looking for. Results are returned according to their frecency (a combination of frequency and recency of visits to that page) ensuring that you're seeing the most relevant matches. An adaptive learning algorithm further tunes the results to your patterns!
Smart Bookmarks Folder: quickly access your recently bookmarked and tagged pages, as well as your more frequently visited pages with the new smart bookmarks folder on your bookmark toolbar.
Places Organizer: view, organize and search through all of your bookmarks, tags, and browsing history with multiple views and smart folders to store your frequent searches. Create and restore full backups whenever you want.
Web-based protocol handlers: web applications, such as your favorite webmail provider, can now be used instead of desktop applications for handling mailto: links from other sites. Similar support is available for other protocols (Web applications will have to first enable this by registering as handlers with Firefox).
Download & Install Add-ons: the Add-ons Manager (Tools > Add-ons) can now be used to download and install a Firefox customization from the thousands of Add-ons available from our community add-ons website. When you first open the Add-ons Manager, a list of recommended Add-ons is shown.
Easy to use Download Actions: a new Applications preferences pane provides a better UI for configuring handlers for various file types and protocol schemes.
Improved Platform for Developers
New graphics and font handling: new graphics and text rendering architectures in Gecko 1.9 provides rendering improvements in CSS, SVG as well as improved display of fonts with ligatures and complex scripts.
Color management: (set gfx.color_management.enabled on in about:config and restart the browser to enable.) Firefox can now adjust images with embedded color profiles.
Offline support: enables web applications to provide offline functionality (website authors must add support for offline browsing to their site for this feature to be available to users).
A more complete overview of Firefox 3 for developers is available for website and add-on developers.
Improved Performance
Speed: improvements to our JavaScript engine as well as profile guided optimizations have resulted in continued improvements in performance. Compared to Firefox 2, web applications like Google Mail and Zoho Office run twice as fast in Firefox 3, and the popular SunSpider test from Apple shows improvements over previous releases.
Memory usage: Several new technologies work together to reduce the amount of memory used by Firefox 3 over a web browsing session. Memory cycles are broken and collected by an automated cycle collector, a new memory allocator reduces fragmentation, hundreds of leaks have been fixed, and caching strategies have been tuned.
Reliability: A user's bookmarks, history, cookies, and preferences are now stored in a transactionally secure database format which will prevent data loss even if their system crashes.