Mozilla Release Notes
Last updated: Feb 16, 2026
Mozilla Products
All Mozilla Release Notes (15)
- Feb 16, 2026
- Date parsed from source:Feb 16, 2026
- First seen by Releasebot:Feb 16, 2026
147.0.4 Firefox Release
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
- Feb 4, 2026
- Date parsed from source:Feb 4, 2026
- First seen by Releasebot:Feb 4, 2026
147.0.3 Firefox Release
Firefox 147.0.3 introduces Interoperability improvements for CSS anchor positioning and Navigation web APIs, plus several bug fixes. It patches a sticky position regression, DevTools reopening with cross-origin iframes, DNS over HTTPS UI, and font rendering on Windows; Wayland popup alignment is to be completed in a future release.
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 Report a problem All of your release notes in one place
Join Releasebot and get updates from Mozilla and hundreds of other software products.
- Jan 27, 2026
- Date parsed from source:Jan 27, 2026
- First seen by Releasebot:Jan 28, 2026
147.0.2 Firefox Release
Firefox 147.0.2 ships with an experimental keyboard shortcut feature you can enable via about:keyboard plus security and stability fixes. It addresses Linux XDG directory issues, reduces excess passkey prompts, and fixes SafeBrowsing flags for better reliability. Feedback welcome on Mozilla Connect.
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 Report a problem - Jan 16, 2026
- Date parsed from source:Jan 16, 2026
- First seen by Releasebot:Jan 17, 2026
147.0.1 Firefox Release
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 Report a problem - Jan 13, 2026
- Date parsed from source:Jan 13, 2026
- First seen by Releasebot:Jan 13, 2026
147.0 Firefox Release
Firefox 147 kicks off WebGPU on Apple Silicon, boosts video performance with zero-copy on supported GPUs, migrates to Safe Browsing V5, tightens local network access for Strict ETP, adds XDG Base Directory support, and optional auto Picture‑in‑Picture for background tabs, plus fixes.
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
- Dec 18, 2025
- Date parsed from source:Dec 18, 2025
- First seen by Releasebot:Dec 18, 2025
146.0.1 Firefox Release
Firefox 146.0.1 is out with broad stability fixes for browsing, graphics and accessibility, plus fingerprint rendering and media playback fixes. It sharpens security, improves sidebar contrast, and fixes backup restore messaging and profile shortcuts.
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)
- Dec 9, 2025
- Date parsed from source:Dec 9, 2025
- First seen by Releasebot:Dec 10, 2025
146.0 Firefox Release
Firefox 146 brings Windows backup to save and restore passwords and bookmarks, a default GPU process on macOS, and broader Firefox Labs access for experimental features. It adds faster search results, a new tab weather opt-in, Linux fractional scaling, and multiple security and developer enhancements.
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
- gopi: 1940198
- Jeffrey Houghton: 1900302
- Julian: 1945449
- Leonardo Paffi: 1996678
- Loago Zambe: 1975592
- Meg Ford: 1898383, 1997187
- Mingyuan Zhao [:MagentaManifold]: 1995168
- Pavel Kireev: 400264, 1852625, 1975612, 1986459, 1988355, 1998237
- PhuongNam: 1968398
- Simon Knott: 1993703
- Thomas J Faughnan Jr: 1994098
- zzjas98: 1997216
Get the most recent version
Download Firefox
Firefox Privacy Notice
Original source Report a problem - Nov 25, 2025
- Date parsed from source:Nov 25, 2025
- First seen by Releasebot:Nov 26, 2025
- Modified by Releasebot:Dec 4, 2025
145.0.2 Firefox Release
Version 145.0.2, first offered to Release channel users on November 25, 2025
Fixed
Fixed an issue that prevented typing in Baidu’s search box when using Chinese IMEs on Windows. (Bug 2000479)
Reference link to 145.0.1 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 146.0)
- Get the most recent version
- Download Firefox
- Firefox Privacy Notice
- All Firefox downloads
- Nov 18, 2025
- Date parsed from source:Nov 18, 2025
- First seen by Releasebot:Nov 19, 2025
145.0.1 Firefox Release
Firefox 145.0.1 arrives with important fixes across Web compatibility, Three.js breakage, Windows launcher startup, and DevTools HAR saves. It also corrects Rogers billing iframe issues and notes an unresolved tab-click bug on maximized windows on a second monitor.
Version 145.0.1, first offered to Release channel users on November 18, 2025
Fixed
- Fixed an issue causing breakage on sites using Three.js. (Bug 1995939)
- Fixed a failure to open Firefox from the desktop launcher on older versions of Windows 10. (Bug 2000411)
- Fixed Web compatibility issues with Rogers. Rogers customers would see a broken iframe with "Firefox Can’t Open This Page" when viewing bills, rather than the billing info. (Bug 1996823)
- Fixed an issue in the Web Developer Tools preventing copy all or save all requests as HAR. (Bug 1995694)
Reference link to 145.0 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.
Get the most recent version
- Download Firefox
- Firefox Privacy Notice
- All Firefox downloads
- Nov 11, 2025
- Date parsed from source:Nov 11, 2025
- First seen by Releasebot:Nov 11, 2025
145.0 Firefox Release
Firefox 145 introduces in-PDF comments, stronger anti-fingerprinting protections, tab group previews, a sidebar password manager, copy-link highlights, translations improvements, new wallpapers, and open-link-from-apps behavior, plus general UI and security updates.
Version 145.0
first offered to Release channel users on November 11, 2025
New
- Add, edit, and delete comments to make your own notes in PDFs (summaries, questions, tasks, etc.). The comment sidebar helps you scan all your comments and quickly jump to them, which is handy for long or heavily marked-up PDFs.
- This version introduces a new phase of privacy protections, building on our research on reducing browser fingerprinting. These new defenses cut the percentage of users seen as unique almost in half, ensuring a safer and more private browsing experience in Private Browsing or when using Enhanced Tracking Protection set to Strict.
- Need a reminder of what tabs are in a group? Hover over the tab group name to get a preview of the tabs inside without opening it.
- You can now access and manage your saved passwords right from the sidebar—no need to open a new tab or window. Stay on the page you’re on and get to your logins faster.
- Copy Link to Highlight allows users to share arbitrary sections of a page with others by copying a link through the context menu with a given selection.
- The Translations feature has an improved experience when translating between languages with different script directions.
- New brand-inspired wallpapers are available for New Tab on desktop, with versions for both light and dark mode.
- With the new Open links from apps next to your active tab setting, you can have links from other applications open next to your active tab instead of at the end of the tab strip.
- Enhanced Bounce Tracking Protection’s stateless mode is now enabled by default in ETP Strict, blocking more advanced tracking techniques based on redirection.
- For most Windows users, the existing desktop shortcut for launching Firefox has been replaced with the desktop launcher, a small program that will launch Firefox if it is installed, but if it is not installed will prompt the user to install Firefox. This will provide an easy installation point for Firefox users who acquire a new Windows device, where Firefox will not be installed by default, but the desktop launcher program may have synced via OneDrive or other cloud storage product. Learn more.
Fixed
- Various security fixes.
Changed
- Firefox no longer supports 32-bit Linux systems. We recommend installing the 64-bit version for continued updates and support.
- Horizontal tabs are now slightly more rounded to match the look of vertical tabs. Buttons and text inputs, including the address bar, have also been updated for consistency.
- When no extensions are installed, clicking the Extensions button now shows a message highlighting how extensions can enhance your browsing, with links to the Firefox Add-ons store.
- Local translation models are now compressed with Zstandard, reducing download sizes and on-device storage consumption. As always, all Firefox translations happen securely and privately on your local device, unlike other browsers that translate using cloud services.
- We updated default automation preferences to better support Agentic browsing, reducing the steps agents need to complete a task and chances for the agent to get stuck.
Enterprise
- You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 145 Release Notes.
Developer
- Microsoft UI Automation phased release rollout at 100%. Microsoft UI Automation is the new accessibility framework for Microsoft Windows. This will provide better assistive technology (AT) support and performance on Windows for current and future assistive technologies.
Web Platform
- Support has been added for the Atomics.waitAsync proposal, which is a non-blocking, asynchronous version of Atomics.wait. This allow synchronization of threads based upon the value in a shared memory location, for more details please consult our MDN documentation.
- Firefox now supports the new Integrity-Policy header for enforcing sub-resource integrity for scripts. Further implementation of this header is underway.
- Added Matroska support for the most commonly used codecs: AVC, HEVC, VP8, VP9, AV1, AAC, Opus, and Vorbis.
- The text-autospace property is now supported, allowing automatic spacing adjustments between characters from different scripts.
- The WebGPU DOM API (spec; MDN) is now available on macOS 26 (Tahoe) on Apple Silicon. For details, see the Mozilla Graphics Team Blog.
Community Contributions
- With the release of Firefox 145, 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:
- Alex Hill: 627771
- Khalid AlHaddad: 1882718, 1975161
- Mag Mukendi: 1982207
- Mateo Mihm: 1957059
- Tatsunori Uchino: 1950321
Get the most recent version
Download Firefox
Firefox Privacy Notice
Original source Report a problem