Fixed

Fixed an issue where websites on internal or corporate networks that require a login prompt would show a blank page. (Bug 2034752)

Fixed an issue that prevented highlighting from working on scanned images in the built-in PDF viewer. (Bug 2034980)

Fixed an issue where the "New" badge persisted on Split View menu items. (Bug 2027793)

Fixed an issue that prevented some webcams from working correctly in video calls. (Bug 2034722)

Fixed an issue where a tab would crash when dragging and dropping nested folders onto a webpage. (Bug 2030461)

Improved how Firefox displays websites with advanced 3D effects, fixing cases where parts of the page could disappear or appear incorrectly. (Bug 2034283)

Fixed an issue that could prevent Firefox’s local backup feature from completing successfully. (Bug 2029240)

Fixed an issue where the status and navigation bars would flicker or show mismatched colors when editing a page’s address. (Bug 2021596)

Improved the appearance of search suggestions in the address bar by preventing icons from appearing stretched or distorted. (Bug 2035353)

Various security fixes.

Reference link to 150.0.1 release notes.

Original source

Version 150.0.1, first offered to Release channel users on April 28, 2026

Fixed

• Fixed an issue where Facebook and other websites might not load properly for users with Bitdefender security software installed. (Bug 2034178)
• Fixed an issue where denying a geolocation permission prompt could cause Firefox to show the system permission dialog again on a second attempt. (Bug 2034120)
• Fixed an issue that prevented tabs from being added to some older saved tab groups. (Bug 2031961)
• Fixed a layout issue where some drop-down menus expanded to display all list items at once. (Bug 2033117)
• Fixed an issue where borders and outlines on some page elements disappeared when pinch zooming or smart zooming on macOS and Windows. (Bug 2030043)
• Various security fixes.

Changed

• All Relay users can now create up to 50 email masks—an increase from the previous limit of 5.

Reference link to 150.0 release notes.

Original source

Version 150.0, first offered to Release channel users on April 21, 2026

New

Split View just got better: You can now right-click any link and choose Open Link in Split View to open it alongside your current tab. You can also search open tabs when creating a split view and quickly reverse tab positions using the new Reverse Tabs option in the tab context menu.

Share multiple tabs in a single step. Select several tabs, right-click, and choose Copy X Links (for Windows and Linux) or choose Share Copy X Links (for MacOS). When pasted into other apps that support rich text, links include both the page title and the URL for easy reading.

You can now use Firefox's built-in PDF editor to reorder, copy, paste, delete, and export pages in a PDF.

Try out real-time, private translations in Firefox Desktop with the about:translations page. Start typing the word "translate" into the URL bar for a quick-action shortcut to the page.

Added support for the GTK emoji picker on Linux, allowing users to insert emoji using the system shortcut (typically Ctrl + .).

Firefox web apps are now available to Windows users who installed Firefox through the Microsoft Store.

The new Firefox Profile management system is now available to all users, including users on Windows 10.

Backing up a profile to a file is now available to all Windows 10 and 11 users, including those who use the new profile management system.

Firefox now ships with a new .rpm package for Linux users on Red Hat, Fedora, openSUSE, and other RPM-based distributions.

Firefox now prompts you to enable location access in Windows settings when granting a website permission to use your location, if geolocation hasn't already been allowed. This behavior, previously limited to some Windows 11 versions, now applies to all supported Windows versions.

The built-in VPN is now available for users in Canada. Note: This feature is not available in enterprise environments.
Currently available in: Canada, France, Germany, United Kingdom, United States
This feature is part of a progressive roll out.

Fixed

Fixed an issue on macOS where, when macOS Lockdown mode is enabled, emoji characters are not displayed in web content.

Various security fixes.

Changed

If you prefer creating tab groups from the context menu, you can now turn off drag-and-drop group creation in Settings > Tabs > Drag tabs to create tab groups.

Enterprise

You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 150 Release Notes.

Developer

Developer Information

A new element-specific section has been added to the pseudo-class toggle panel including a toggle for the :open pseudo-class, which is only available for elements that have an open state like elements. The existing toggle for the :visited pseudo-class was also moved there, as it only applies to and elements. (Learn More)

The Document.caretPositionFromPoint() method now only returns a position in a shadow DOM if its ShadowRoot is passed in the newly-added shadowRoots option.

The devtools network monitor now indicates when a connection used a certificate issued by a certificate authority not in Mozilla's Root CA Program.

Web Platform

Firefox now supports the ariaNotify API for accessibility notifications (e.g. for screen readers) as a more ergonomic and reliable alternative to ARIA live regions.

Firefox now supports media element pseudo-classes (e.g., :playing, :paused) to allow more precise styling based on media playback state.

Added support for the highlightsFromPoint() API, which allows web pages to interact with CSS Highlights by returning all Highlights at a given point.

Firefox now supports light-dark() on images, just like on colors, which is very useful for supporting dark mode on websites.

The color-mix() function previously accepted only two color values. This limitation has now been removed, allowing the function to accept an arbitrary number of colors.

Added support for a new auto value on the sizes attribute for lazy-loaded image elements with multiple images defined via srcset. This allows the browser to automatically select the right image based on the layout width of the image element. (Learn More)

Unresolved

Users with Bitdefender security software installed may experience problems loading websites, particularly Facebook.com. We are working on a workaround, but as a temporary mitigation, disabling Bitdefender or turning off its traffic filtering features may resolve the issue.

Community Contributions

With the release of Firefox 150, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 22 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:

Akeldama: 1718781
Alex Reisner: 2005628
amar.p.t.1397: 2003168
Anshul Malik: 1561441, 1814459, 2018447, 2018843, 2019010
baris: 2008127
Ben: 1967026
Chad Gratts: 2003111
Elliott Ashby: 1674654
geppy: 1767617
Giedrius Visokinskas [:gvisokinskas]: 1910291
Jocsan: 2016933
Justin Peter: 1971538, 2010486, 2018840, 2018842
karan68: 1998004
Knot False: 1861645
Liam Wachter: 2018739
Michael Lynch: 2023046
Mohammed Abdullah: 1942439
Nathan Johnson [:narjoDev]: 1895394
Pushkar Singh: 2003191
Sally Frye: 2003170
Thien Pham: 2001134
tushar sariya: 928224, 1939501, 1975962

Original source

Version 149.0.2, first offered to Release channel users on April 7, 2026

Fixed

• Various security fixes.
• Fixed an issue where certain parts of web pages, such as drop-down menus and specific styles, did not appear correctly when printing. (Bug 2026109)
• Fixed an issue where some website error pages displayed generic connection messages instead of the specific error code and description provided by the server. (Bug 2023800)
• Fixed a crash that occurred when using certain security keys or WebAuthn features for two-factor authentication. (Bug 2026688)
• Fixed an issue on Linux where the browser toolbar could become unresponsive to mouse clicks after dragging a tab when using Wayland. (Bug 2022238)
• Fixed a layout issue where text inside certain graphics (SVG) appeared shifted or misaligned from its intended position. (Bug 2024647)
• Fixed an issue where the "Send to device" option failed to work when used from the Open Tabs section in Firefox View. (Bug 2023201)

Enterprise

• Introduced a new enterprise policy that allows administrators to directly manage and control AI-related features within Firefox. (Bug 2019983)
• Fixed an issue where enterprise policies for the browser homepage and start page were not being applied correctly. (Bug 2027888)
• Introduced a new enterprise policy that allows administrators to prevent the built-in VPN and IP protection features from being available to users. (Bug 2022365)

Reference link to 149.0 release notes.

Original source

Version 149.0, first offered to Release channel users on March 24, 2026

New

View two pages side-by-side in a single window with the new Split View feature that makes it easier to compare information, research topics or work across two pages at once. To create a split view, select one or two tabs and choose Add to Split View or Open in Split View.

Firefox now offers a free built-in VPN. Whether you’re using public Wi-Fi while traveling, searching for sensitive health information, or shopping for something personal, this feature gives you a simple way to stay protected. Once you sign in and turn it on, you can hide your location and IP address by routing it through a secure proxy while you browse in Firefox. You will get 50 GB of protection every month, with the option to turn it on or off for specific websites. This feature is progressively rolling out in the US, UK, Germany and France starting today.

This feature is part of a progressive roll out.

Many PDF files will now load significantly faster thanks to hardware acceleration.

Firefox now automatically blocks notifications and permanently revokes permissions for any website flagged as malicious by SafeBrowsing. This prevents unsafe sites from sending background notifications to users, commonly used for ads, spam or phishing.

You can now add a Share button to your toolbar via Customize Toolbar, making it easy to share the current tab using your Windows or macOS system sharing options.

Address Autofill is enabled for users in Australia, India, Italy, Poland and Austria.

Explore more of the web with new on-device translation support for Bosnian, Norwegian Bokmål, Serbian and Thai — plus improved accuracy for Croatian.

Firefox Labs

Tab notes feature that lets you attach a short note to a web page is now available in Firefox Labs. You can use notes to remember why you opened a page, what you planned to do next or any details you want to revisit later. Please give notes a try and share your feedback on what works well and what can be improved.

Fixed

Increased robustness of HTTP/3 upload performance for unstable network conditions.

Various security fixes.

Changed

The TrustPanel combines the privacy and security panels accessed from the address bar to give the user one place to check the Privacy and Security settings of the current page. Learn more.

Security has been strengthened by tightening the requirements for JavaScript files that can be loaded in the parent process, providing additional defense in depth against potential threats.

On Linux, Firefox will now default to the XDG portal file picker if available, rather than the GTK3 one, which is usually better integrated with the user's desktop environment, and more powerful.

Firefox error pages have a fresh new look, with updated visuals that better match the overall feel of Firefox. The redesigned pages create a more cohesive experience while making it clearer what went wrong.

On Windows, Firefox will use the modern Windows.Devices.Geolocation API for geolocation instead of Windows 7 location API.

Developer

The toolbar of the Storage Inspector now has a button to delete all entries of the currently selected storage.

Besides each CSS declaration related to a computed value shown in the Computed view there's now an icon to jump to it in the Rules view.

Web Platform

showPicker() now supports text-based elements with an associated , displaying the autofill dropdown. See documentation.

The functions xywh() and rect() were previously implemented for the clip-path and offset-path properties. They are now also available for the shape-outside property.

The math value of the CSS font-family is now supported and used by default for MathML's element. It enables Web developers to indicate special fonts with advanced math features should be used. Firefox will rely on the serif font for mathematics defined in Firefox preferences.

Added support for the HTML attribute popover="hint".

Enabled media element pseudo-classes, such as :playing, :paused …

Enabled the spec-compliant HTMLMediaElement.captureStream() API.

Added support for closing popovers & dialogs with the Android Back Button, and implemented the CloseWatcher API for handling this in script.

The new Reporting API provides a generic reporting mechanism for web applications to use to make reports available based on various platform features (for example Content Security Policy, Permissions-Policy or feature deprecation reports) in a consistent manner.

Community

With the release of Firefox 149, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 25 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:

• aaryamannsingh3: 1968250
• Alex Leykin [:alexff]: 1989707
• César Pedraza [:cpedraza]: 1933577
• Daniel Tang: 2012556
• Denys [:denyshon]: 1768757, 1804855, 1975076, 2010370, 2010914
• felix: 2008777
• Franccesco: 1984274
• Gregor Dschung [:chkpnt]: 2004881
• Henry Yeary: 1944835, 2010907
• Jacob: 2014579
• kian: 1643915
• lucrobertvillanueva: 1988103
• Matt M: 2012236
• MUTHUSRIHEMADHARSHINI: 1994079
• Nishchay [:nish]: 1945967
• Ranvir Sahota: 1884983
• Seva Alipov: 2000120
• Simon: 1973209
• Thomas Sileo: 1623654, 2011537
• torrenceb90: 2003192
• Tyler Thrailkill [:snowe]: 2003187, 2012756, 2013500
• vadimhack.ru: 2016172
• yooughtul: 1944213
• Yung Kai [:YuK]: 2011420
• Yvon Cognard: 1953375

Original source

148.0.2

Firefox Release

March 10, 2026

Version 148.0.2, first offered to Release channel users on March 10, 2026

Fixed

• Fixed an issue where searches entered in the Firefox Home search field were incorrectly redirected to the address bar for some users who had disabled search handoff behavior via advanced settings. (Bug 2017049)

• Fixed an issue where some web-based rich text editors stopped applying formatting, such as bold or italic. (Bug 2020927)

• Fixed an issue where videos could autoplay unexpectedly on YouTube despite autoplay being blocked, particularly impacting screen reader users. (Bug 2020233)

• Fixed an issue that caused some absolutely positioned elements meant to be centered, for example, using margin: auto with inset: 0, to appear left-aligned on initial load. (Bug 2017440)

• Fixed an issue where the “Switch to Tab” suggestion in the address bar appeared blank for pages without a title. (Bug 2020341)

• Fixed an issue that could reduce video quality on Windows systems using NVIDIA GPUs with Video Super Resolution enabled. (Bug 2019515)

• Various security fixes.

Reference link to 148.0 release notes.

Original source

Version 148.0, first offered to Release channel users on February 24, 2026

New

• Added an AI Controls section to Settings for managing AI-enhanced features. Learn more.
• Firefox now has improved support for screen readers accessing mathematical formulas embedded in PDFs.
• Remote improvements are now decoupled from telemetry requirements in Firefox Settings. You can now opt into receiving remote browser changes even if you have opted out of sharing telemetry or participating in our experimental studies.
• Firefox Backup is now available on Windows 10 to users who also use the “Clear history when Firefox closes” capability. Backups will not include any data which is set to be cleared when Firefox is closed.
• The following languages are now available for translation:
  • Translation into and from Traditional Chinese.
  • Translation into Vietnamese.
• New Tab wallpapers will now appear on new container tabs as well as new default tabs.

Fixed

• Fixed an issue where a language pack could become disabled after a major update, causing Firefox to display in the wrong language.
• On Windows, dragging a downloaded image to Adobe Illustrator now correctly inserts the image instead of its URL.
• Various security fixes.

Developer

• Developer Information

Web Platform

• The initial about:blank document is now Web-compatible. If the first navigation of a browsing context goes to about:blank, it completes synchronously and is no longer replaced by a second parser-generated document.
• Service worker support for WebGPU has been added, making it available in all worker contexts. Service workers allow WebGPU to run in the background, which is particularly useful for extensions and other pages that can meaningfully share resources across multiple tabs and time periods.
• Firefox now supports the Iterator.zip() and Iterator.zipKeyed() methods from the joint iteration proposal. This allows zipping together underlying iterators into an iterator over values grouped by position, similar to zip in many other languages.
• Firefox now supports the Trusted Types API, which is primarily aimed at preventing cross-site scripting attacks.
• Firefox now supports the Sanitizer API, which provides new methods for HTML manipulation. The element.setHTML() method enables developers to insert HTML content similarly to element.innerHTML, but without the security vulnerabilities such as cross-site scripting (XSS). A complementary method, document.parseHTML(), is also available for parsing HTML safely.
• Firefox now supports the location.ancestorOrigins attribute.
• Firefox now supports the NavigationPrecommitController.addHandler() interface of the Navigation API. This allows registering a post-commit navigation handler during the pre-commit phase, to allow a multi-step navigation process.
• Firefox now supports the position-try-order property as part of CSS Anchor Positioning, controlling the order of fallback positioning attempts.
• Firefox now supports the CSS shape() function, which allows defining responsive free-form shapes in properties that take shapes like clip-path. Unlike path(), it uses standard CSS syntax, supports various CSS units, and allows mathematical functions.

Community

With the release of Firefox 148, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 18 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:

• Charlotte Wilson [:cswilson252]: 1774438
• Doğu Abaris: 2006856
• Ethan Hawksley: 2008109
• Johannes Odland: 2005934
• kentaro tachikawa: 1819853
• Kiril Panayotov: 2001615
• Matt Kwee: 1938752
• Nathan: 2004797
• Noriaki Watanabe: 2004688, 2005964, 2006047, 2006777, 2007503, 2008007, 2008072, 2008282
• Rachel Rusiecki: 1804921
• Rocco Jiang: 2008967
• Sameem [:sameembaba]: 1976416
• Serah Nderi: 1306461, 2007291
• Sergey Radionov: 1976489
• valadaptive: 1983387
• Vignesh Sadankae: 2003183
• Will Medina [:willyelm]: 2003345
• Yunju Lee: 1987021, 2003165, 2004209, 2004268

Original source

147.0.4 Firefox Release

February 16, 2026

Version 147.0.4, first offered to Release channel users on February 16, 2026

Fixed

Fixed an issue that could cause the New Tab Page to appear blank for some users. (Bug 2014616)
Security fix.

Reference link to 147.0.3 release notes.

Unresolved

On Linux (Wayland) systems, certain popups and context menus will sometimes open in the wrong place, such as the top-left corner of the window. This will will be addressed in a future release.

Get the most recent version

• Download Firefox
• Firefox Privacy Notice
• All Firefox downloads

Original source

Version 147.0.3, first offered to Release channel users on February 4, 2026

New

• Interoperability improvements for the CSS anchor positioning and Navigation web APIs.

Fixed

• Fixed a regression where position: sticky elements on some webpages could appear stuck or fail to update while mousewheel-scrolling after certain :hover interactions. (Bug 2010481)
• Fixed an issue where the Firefox Developer Tools could fail to re-open after using the Inspector’s node picker and reloading a page containing cross-origin iframes. (Bug 2003810)
• Fixed an issue where the DNS over HTTPS provider settings section could appear as a blank box, preventing users from seeing the current setting or changing it. (Bug 2010501)
• Fixed an issue on Windows systems with a large number of fonts installed where parts of the Firefox UI (tabs, menus, and Settings) could display garbled characters or symbols instead of readable text. (Bug 2012950)

Reference link to 147.0.2 release notes.

Unresolved

On Linux (Wayland) systems, certain popups and context menus will sometimes open in the wrong place, such as the top-left corner of the window. Firefox 147.0.3 has a partial mitigation for this problem and remaining instances will be addressed in a future release. (Bug 2003045)

Original source

147.0.2 Firefox Release

January 27, 2026

Version 147.0.2, first offered to Release channel users on January 27, 2026

New

• Firefox now allows you to customize your keyboard shortcuts to replace hard-to-type or hard-to-remember hotkeys, eliminate conflicts with other software, and create your preferred set. Access this experimental new feature by typing about:keyboard in the address bar and please share your feedback with us on Mozilla Connect!

Fixed

• Resolved various issues with missing or impaired browser functionality when using XDG Base Directories on Linux. (Bug 2011300)
• Fixed an issue causing excess passkey prompts to appear when logging into some sites. (Bug 2010919)
• Fixed an issue that could lead to sites being incorrectly flagged as malicious by SafeBrowsing. (Bug 2010956)
• Various security fixes.

Reference link to 147.0.1 release notes.

Original source

Version 147.0.1, first offered to Release channel users on January 16, 2026

Fixed

• Fixed compatibility problems with websites that use the new Compression Dictionaries technology, such as ChatGPT, by temporarily disabling the feature. (Bug 2010712)
• Fixed an issue where an unnecessary empty directory was created on Linux systems. (Bug 2001887)
• Fixed an issue where time formats could cause certain websites to display incorrectly. (Bug 2010411)

Reference link to 147.0 release notes.

Original source

147.0 Firefox Release

January 13, 2026

Version 147.0, first offered to Release channel users on January 13, 2026

New

• WebGPU support is now enabled for devices with Apple Silicon processors on all supported macOS versions.
• Improved video playback performance on systems with AMD GPUs by enabling zero-copy playback for hardware-decoded video where supported, bringing them to parity with Intel and NVIDIA GPUs.
• Firefox now supports the Safe Browsing V5 protocol and is migrating from Safe Browsing V4 to the local list mode of Safe Browsing V5 protocol.
• Users with Enhanced Tracking Protection (ETP) set to Strict will have local network access restrictions enabled by default. Firefox will now require users to explicitly allow public websites to access local network resources.
  This feature is part of a progressive roll out.
• Firefox now supports the Freedesktop.org XDG Base Directory Specification.
• A Picture-in-Picture player window can now optionally be opened automatically for a video playing in a tab when that tab goes into the background. A special thanks to volunteer Daniele Ferla for contributing this feature!

Fixed

• Fixed an issue that prevented some Windows users from selecting a tab when the cursor was at the top of the screen and the Firefox window was maximized.
• Fixed a bug that made HTTP/3 requests containing non-UTF-8 header values time out or fall back to HTTP/2 after a while.
• A draggable button can now be dragged if initiated from the button itself.
• For Linux GNOME Mutter users, window and rendering surface sizes were updated to match the actual pixel grid so Firefox delivers sharp rendering on fractionally scaled displays regardless of the actual window size.
• Various security fixes.

Changed

• Firefox now uses the same quality values (q-values) in Accept-Language headers as other major browsers. The second language preference is now sent as q=0.9 instead of q=0.5, with subsequent language preferences decreasing by 0.1 each (minimum 0.1). This change fixes compatibility issues with some servers that incorrectly rejected requests with lower quality values.

Enterprise

• You can find information about policy updates and enterprise-specific bug fixes in the Firefox for Enterprise 147 Release Notes.

Developer

• Developer Information
• View Transitions: View transition pseudo-elements now appear in the elements panel and the associated animations appear in the animations panel.
• Anchor positioning: Elements with a valid anchor-name are given an 'anchor' badge in the elements view, and @position-try CSS rules are now displayed in the CSS rules panel when an element using position-try-fallbacks is selected.
• The JSON viewer now has a button to import the resource into Firefox Profiler to get a breakdown of its size.
• Pseudo-element selectors can now be added/edited in the CSS rules panel.

Web Platform

• Added support for the Navigation API. This API provides the ability to initiate, intercept, and manage browser navigation actions. It is a successor to previous web platform features such as the History API and window.location, which solves their shortcomings.
• The Unicode ICU library was updated to release 78, bringing support for Unicode 17 and new locales.
• ES modules in service workers are now supported, aligning Firefox with other major browsers and improving compatibility for modern web apps.
• Support for CSS Module Scripts was added, allowing stylesheets to be imported using the JavaScript module system and import attributes.
• The CSS counter-* and quotes properties are now supported in the ::marker pseudo-element.
• Both CompressionStream and DecompressionStream now support the Brotli format.
• Firefox now supports the :active-view-transition-type selector and associated View Transitions API changes.
• Firefox now exposes the view transition currently active on the document via the Document.activeViewTransition property.
• Support for CSS anchor positioning was added, enabling tethering elements. The anchor-positioned elements can then have their size and position set relative to the anchor elements to which they are bound.
• Firefox now supports Storage-Access-Headers, allowing servers to opt into unpartitioned cookies via HTTP headers if storage-access was granted prior to the Storage Access API.
• Implemented CSS root-font-relative units rcap, rch, rex, and ric.

Community Contributions

With the release of Firefox 147, 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:

• [:Joe Cardoso] Loan de Deus Vieira Cardoso: 1730474, 1897620
• Aaron Kriegman: 1955625
• Aloys: 2002985, 2003194
• Areeba: 2000792
• Daniel Singer: 1895228, 1981571
• Dominique: 1995325, 2000957
• James Hay: 1864284
• Kipchumba Chelilim [:mrchumbastic]: 1905323, 1956817, 1994752
• Lorenz A: 983296, 1632071, 1665702, 1709063, 2004038, 2004205
• Michal Bozon: 1998963
• Scott Venkataraman: 1995324, 1999325
• Sick Leviathan: 1362499, 1918733, 1960699
• Tom Forbes: 1897424
• witty.31.06: 2000613, 2000765

Original source

Version 146.0.1, first offered to Release channel users on December 18, 2025

Fixed

• Improved overall stability by fixing crashes related to browsing, graphics, and accessibility features. (Bugs 2001160, 1998185, 1998188)
• Fixed an issue where fingerprinting protection caused incorrect font rendering on popular websites. (Bug 2000429)
• Fixed crashes related to media playback and GMP process shutdown. (Bug 2002697)
• Fixed an issue where desktop profile shortcuts were being unintentionally removed when changing copied profile settings. (Bug 1998209)
• Improved sidebar text contrast when using vertical tabs with certain themes. (Bug 2006091)
• When restoring from a backup, the restore success message will appear over the new tab page instead of one of the tabs restored from a backup, to avoid cases where the restored tab canceled the restore success message. (Bug 2003307)
• Various security fixes.

Reference link to 146.0 release notes.

Unresolved

• On Windows, clicking tabs may not work at the very top of the screen when Firefox is maximized on a second monitor. We’re working to fix this in a future release. (Fixed in 147.0)

Original source

Version 146.0, first offered to Release channel users on December 9, 2025

New

Windows 10 users can now automatically protect their passwords, bookmarks, and more by turning on backup in Firefox. Your browsing data is saved daily on your device and can be encrypted with a password. When you set up a fresh install of Firefox on any operating system for a new device or your current one, you can restore from this backup and pick up right where you left off. This feature is currently available on Windows devices and will be coming to other operating systems soon.

This feature is part of a progressive roll out.

MacOS users now have a dedicated GPU process by default. This includes WebGPU, WebGL, and Firefox's own WebRender. With this feature enabled, fatal errors in graphics code will no longer crash the browser, and will instead transparently restart the GPU process.

Firefox Labs is now available to all desktop users, regardless of whether they choose to participate in studies or submit telemetry. This means more experimental features are now available to more people.

Users can now skip the results page and see direct results as they type in the search bar for faster, simpler browsing.

This feature is part of a progressive roll out.

There is a New Tab Weather opt-in workflow available for users in the EU and some other countries, where they can choose whether to enable location detection or manually search for a location.

This feature is part of a progressive roll out.

Firefox now natively supports fractional scaled displays on Linux (Wayland), making rendering more effective.

For users of the English-language versions of Firefox in France, Germany, and Italy, the address bar now shows English-language suggestions for holidays and other important dates.

Fixed

When the timepicker is enabled for and , it now provides full keyboard and assistive technology support. This update also improves the behavior of the time spin buttons for users who prefer reduced motion. The Firefox Accessibility team hopes that making the built-in timepicker accessible will encourage wider adoption of browser-provided time and date inputs across the web, reducing the need for custom controls, and improving accessibility for all users.

Various security fixes.

Changed

The Colors dialog in Settings now uses clearer color picker controls that keep each color sample next to its label. It makes it easier to understand and adjust text, background, and link colors when using a forced colors palette to customize the default text, link, and page background colors, especially with or without screen magnifiers.

Firefox removed support for Direct2D on Windows. If you still require Direct2D support, please use ESR 140.0 or higher.

Enterprise

You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 146 Release Notes.

Developer

Firefox now supports ML-KEM for WebRTC, by sending a post-quantum (PQ) key share during the DTLS 1.3 handshake. ML-KEM is the next-generation public-key cryptosystem that is believed to be secure against attackers with large quantum computers.

Firefox now supports compressed elliptic curve points in WebCrypto. These reduce the size of public keys by nearly half, saving bandwidth and storage, while still allowing the full point to be reconstructed mathematically.

The Skia graphics library has been updated to improve rendering performance and compatibility.

Unused CSS custom properties are now hidden by default in the Rule view of the Inspector. This not only reduces clutter, but in some cases also speeds up the rendering of the inspector panel.

Web Platform

The @scope rule is now supported, allowing authors to restrict styling to a subtree of the DOM. This avoids having to write overly-specific selectors.

Firefox now supports the contrast-color() CSS function that takes a color value and returns a contrasting color. Note that the specification currently restricts the contrasting color to black or white. This limitation is expected to be removed in the future. (Learn more)

Introduced the text-decoration-inset property, which allows authors to adjust the start and end points of line decorations.

Firefox now supports the legacy -webkit-fill-available keyword as a value for the CSS width and height properties. This improves rendering of content on websites that use this value. This keyword is an alias for the recently standardized stretch keyword, which is not yet enabled in Firefox.

Unresolved

On Windows, clicking tabs may not work at the very top of the screen when Firefox is maximized on a second monitor. We’re working to fix this in a future release. (Fixed in 147.0)

Community Contributions

With the release of Firefox 146, 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:

• Alex Johnson: 1924339
• Apurva: 1973318
• Cornelius Emase: 1913086, 1977921, 1996578, 1996859, 1998012
• Ethan Gallucci: 1991983
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