Firefox Release Notes

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 Report a problem

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

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

Original source Report a problem

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

Original source Report a problem

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

Version 144.0.2, first offered to Release channel users on October 28, 2025

Fixed

• Fixed an issue where the list of available locales in about:settings contained more locales than were downloaded or currently supported. (Bug 1994642)
• Fixed an issue where using the keyboard to open the Unified Search dropdown was inconsistent. The dropdown now expands properly, allowing users to select a search engine using the keyboard. (Bug 1979826)
• Fixed an issue where curated photo collections on Microsoft OneDrive's Photos “For You” page failed to load, showing a gray screen instead of content. Collections now display as expected. (Bug 1986533)
• Fixed a startup crash affecting Windows users with Avast or other security software installed. (Bug 1992678)
• Fixed an issue on macOS where the emoji picker shortcut and menu entry stopped working after switching between apps. (Bug 1980815)
• Fixed an issue on macOS where dragging images from Firefox into third-party apps like Preview could fail or behave unexpectedly. (Bug 1995345)
• Fixed performance and video playback issues on macOS 26 (Tahoe) that occurred when the system was under heavy load. (Bug 1995638)
• Fixed a browser hang on macOS 26 (Tahoe) that could occur when bookmark folders contained loops or repeated references to themselves. (Bug 1995621)

Security fix.

Reference link to 144.0 release notes.

Get the most recent version

Download Firefox

Firefox Privacy Notice

Original source Report a problem

Version 144.0, first offered to Release channel users on October 14, 2025

New

• Focus on just one tab in a group without the clutter. Your active tab now stays in view, keeping things tidy even with the group collapsed.
• We’re excited to share another tab groups update that addresses a top request from our community! You can now drag a tab into a collapsed group without automatically expanding it. It’s a quick way to stay organized while minimizing visual distractions.
• Profile management, now available to all users globally, helps protect your privacy and stay focused by separating your online life into distinct profiles — for work, school, vacation planning, or whatever you choose. You can now name your profiles and customize them with avatars and color themes for easy recognition, then quickly switch between them — all while keeping bookmarks, tabs, and browsing history completely separate.
• You can now close a Picture-in-Picture window without pausing the video. Press Shift + Click on the close button or use Shift + Esc to exit while keeping playback uninterrupted.
• Logins stored in the Firefox Password Manager are now encrypted on disk using a modern encryption scheme (AES-256-CBC), replacing the older 3DES-CBC. This change improves local data protection. Logins synced through Firefox Sync remain end-to-end encrypted and already use AES-256-GCM.
• Visual search powered by Google Lens
  With just a right-click on any image, you can now:
  • ✨ Find similar products, places, or objects
  • ✨ Copy, translate, or search text from images
  • ✨ Get inspiration for learning, travel, or shopping
    Look for the new “Search Image with Google Lens” option in your right-click menu (highlighted with a NEW badge at first).
    This is a desktop-only feature, available worldwide. Your default search engine must be set to Google in order to use it.
• Perplexity AI Search in Firefox
  On desktop, Firefox now includes Perplexity, an AI-powered answer engine built into the browser. Perplexity delivers direct, conversational answers to complex questions, helping you get quick summaries, accurate references, or creative inspiration without digging through multiple sources. It’s available worldwide from the address bar via the unified search button.
• The following languages are now available for translation:
  • Azerbaijani
  • Bangla
  • Icelandic

Fixed

• Various security fixes.
• The following languages have improved translation quality:
  • Arabic
  • Bulgarian
  • Catalan
  • Chinese (Simplified)
  • Czech
  • Dutch
  • Estonian
  • Finnish
  • French
  • German
  • Hungarian
  • Italian
  • Japanese
  • Portuguese
  • Persian
  • Spanish
  • Ukrainian

Changed

• On Windows, when opening a link from another application, Firefox will only use a window on the current virtual desktop or open a new window if needed.

Enterprise

• You can find information about policy updates and enterprise specific bug fixes in the Firefox for Enterprise 144 Release Notes.

Developer

• You can now jump to a CSS custom property's definition from within the var() function in style rules.
• The events tooltip in the Inspector now shows a badge besides custom events, making it easier to differentiate them from built-in events.

Web Platform

• Firefox now supports the Element.moveBefore API.
• Firefox now supports math-shift compact.
• Firefox now supports PerformanceEventTiming.interactionId, allowing developers to group related input events. This enables support for the Interaction to Next Paint (INP) responsiveness metric.
• Firefox now supports the command and commandfor attributes.
• Firefox now supports the View Transitions API Level 1. The View Transitions API provides a mechanism for easily creating animated transitions between different website views.
• Dithering is now applied when linear-gradient, conic-gradient, and radial-gradient are rendered using hardware WebRender.
• Firefox now supports the upsert proposal. This adds getOrInsert and getOrInsertComputed methods to Map and WeakMap. These methods either return the value associated with a key, or insert a default value, and then return that value, simplifying handling of cases where it's not known if a key is already present in the Map or WeakMap.
• Firefox now supports the lock() and unlock() methods of ScreenOrientation interface on Windows tablets and Android devices.
• Firefox now supports worker transfer for RTCDataChannel.
• Firefox now supports the resizeMode getUserMedia constraint, allowing developers to crop and downscale video captured from a camera to any resolution they choose.
• Firefox now supports the WebGPU GPUDevice.importExternalTexture API on Windows.
• WebCodecs on Windows now has a batch-encoding path for VideoEncoder, improving performance with higher throughput and lower submission latency due to a larger default batch size.
• Gecko-specific CSS2Properties was renamed to CSSStyleProperties, to align with the latest web standard and for better interoperability with other browser engines.

Community Contributions

• With the release of Firefox 144, we are pleased to welcome the developers who contributed their first code change to Firefox in this release, 12 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:
  • Alice Boxhall: 1981341
  • David [:david-loe]: 1726108
  • Diogo Sousa: 1987258
  • fdangers: 1975105
  • jocelyne.ah1: 1980995
  • Josh Berry: 1984553
  • Kyle Huey [:khuey]: 1983994
  • Martin Bruse: 1987128
  • Mountain Dude: 1984695
  • parisoplop: 1984782
  • Riz: 1280266
  • s175911: 1985163

Get the most recent version

• Download Firefox

Original source Report a problem

Fixed

Improved Firefox' connection fallback behavior to mitigate sporadic slow/failed loads on some Google sites on systems with certain third-party software installed. (Bug 1990699)

Reference link to 143.0.3 release notes.

Get the most recent version

• Download Firefox

• Download Firefox

• Download Firefox

• Windows

• Mac

• iOS

• Android

• Linux

Custom Download Options

Latest Builds

• Nightly
• Beta

Firefox for Business

• Enterprise

Community

• Connect
• Contribute
• Developer

Resources

• Compare
• Release Notes
• Learn
• Support
• Add-ons
• Community
• Blog

Follow Us

• Instagram

• YouTube

• TikTok

• Bluesky

• Podcast

• Website Privacy Notice

• Terms of Use

• Cookie Policy

• Community Participation Guidelines

• Logo Trademark Licensing

Powered by Mozilla
Putting people before profits since 1998

Original source Report a problem

Version 143.0.3, first offered to Release channel users on September 30, 2025

Fixed

• Adjusted the timing of the new drag-to-pin interaction cue for better reliability. (Bug 1989344)
• Fixed an issue that prevented some extensions from updating via the Add-ons Manager. (Bug 1984724)
• Fixed a regression that prevented Firefox View sections from collapsing/expanding as expected. (Bug 1989200)
• Addressed a WebExtensions storage issue that could cause Firefox to crash on startup with certain extensions installed. (Bug 1989840)
• Fixed an issue where opening an add-on's "Extension settings" from the post-install prompt could break the Customize tab and some keyboard shortcuts until restart. (Bug 1983869)
• Reduced long delays when loading certain websites while connected to networks that block UDP connections. (Bug 1980812)
• Various stability and security fixes.

Reference link to 143.0.1 release notes.

Original source Report a problem

143.0.1 Firefox Release

September 19, 2025

Version 143.0.1, first offered to Release channel users on September 19, 2025

Fixed

• Fixed a tab crash experienced by some users caused by DLL injection. (Bug 1872261)

Reference link to 143.0 release notes.

Get the most recent version

• Download Firefox

Need help or want to leave feedback?

• File a bug
• Leave feedback

Get Involved

Did you know that most of the content in Firefox Support was written by volunteers?
Find out more

Other Resources

• Developer Information
• Complete list of changes for this release
• Press Kit
• Mozilla and Firefox News
• Firefox Extended Support Release
• All Firefox for Desktop Releases
• Learn more about Firefox

Original source Report a problem