| Version | Change log |
| Firefox 135.0.1 Feb 18, 2025 |
New: Firefox Translations now supports more languages than ever! Pages in Simplified Chinese, Japanese, and Korean can now be translated and Russian is now available as a target language for translating into. The credit card autofill feature is now being gradually rolled out to all users globally. AI Chatbot access is now being gradually rolled out to all users. To use this optional feature, choose AI Chatbot from the sidebar or from Firefox Labs. Then, complete the provider selection to see the chat interface become available on the sidebar. Firefox now enforces certificate transparency, requiring web servers to provide sufficient proof that their certificates were publicly disclosed before they will be trusted. This only affects servers using certificates issued by a certificate authority in Mozilla's Root CA Program. Additionally, the CRLite certificate revocation checking mechanism is also being gradually rolled out, substantially improving the performance of these checks. Firefox now includes safeguards to prevent sites from abusing the history API by generating excessive history entries, which can make navigating with the back and forward buttons difficult by cluttering the history. This intervention ensures that such entries, unless interacted with by the user, are skipped when using the back and forward buttons. Fixed: Made improvements to the Translations feature which will reduce the likelihood that models will invent new, made-up words under some circumstances. Various security fixes: CVE-2025-1009: Use-after-free in XSLT CVE-2025-1010: Use-after-free in Custom Highlight CVE-2025-1018: Fullscreen notification is not displayed when fullscreen is re-requested CVE-2025-1011: A bug in WebAssembly code generation could result in a crash CVE-2025-1012: Use-after-free during concurrent delazification CVE-2025-1019: Fullscreen notification not properly displayed CVE-2025-1013: Potential opening of private browsing tabs in normal browsing windows CVE-2025-1014: Ce |
| Firefox 135.0 Feb 4, 2025 |
New: Hardware-accelerated playback of HEVC video content is now supported on macOS. Hardware video decoding is now enabled for AMD GPUs on Linux. Firefox will upgrade page loads to HTTPS and gracefully fall back to HTTP if that does not succeed. This behavior is known as HTTPS-First. Having any issues with a website on Firefox for Android, yet the site seems to be working as expected on another browser? You can now let us know via the Web Compatibility Reporting Tool. To access it: Open the Menu via the three-dot button while on a browser tab Tap on “Report broken site” Provide the form with as much information as possible, and you’ll directly help us detect, target, and fix the most impacted sites to make your browsing experience on Firefox smoother. Fixed: Firefox will now prefer PNG when copying images out of Firefox, allowing the preservation of transparency. Changed: Cookie Banner Handling by default in Private Browsing is now disabled. This was previously enabled only in Nightly and Beta. The feature can be enabled via the cookiebanners.service.mode and cookiebanners.service.mode.privateBrowsing prefs in about:config. Developer: The Developer Tools debugger editor now uses Codemirror 6 which improves performance. Changes for add-on developers: menus.update and menus.remove and the aliases contextMenus.update and contextMenus.remove now reject with an error when the menu item doesn't exist. Previously, the error was ignored and the promise fulfilled. (Firefox bug 1688743). Web Platform: Added support for the Intl.DurationFormat object, this enables language-sensitive duration formatting. Added support for the CSS :open pseudo-class for styling elements that can be toggled “open” to display more content. Added support for the :has-slotted pseudo-class, allowing authors to style the contents of a <slot> element when it is not empty or not using the default value. The value plaintext-only can now be specified for the contenteditable attribute, maki |
| Firefox 134.0.2 Jan 21, 2025 |
Fixed: Fixed UI hangs happening on YouTube and Google Docs in some situations (Bug 1939295). Fixed a startup crash affecting some users upgrading from Firefox 133 (Bug 1941134). Fixed an issue where search engines selection menus and context menus could be broken if a user had previously reverted to an earlier version (Bug 1940533). |
| Firefox 134.0.1 Jan 17, 2025 |
New: Users on macOS and Linux are now given the option to close only the current tab if the Quit keyboard shortcut is used while multiple tabs are open in the window. Firefox now includes new safeguards to prevent sites from overwhelming the Back history by spamming numerous consecutive visits over a short time. To help Mozilla find and fix crashes, you can opt into automatically sharing Firefox for Android crash reports by checking the new Data Collection setting "Automatically submit crash reports". Changed: The "Copy Without Site Tracking" menu item was renamed to "Copy Clean Link" to help clarify expectations around what the feature does. "Copy Clean Link" is a list based approach to remove known tracking parameters from links. This option can also now be used on plain text links. Linux binaries are now provided in XZ format, replacing the previous BZ2 format, offering faster unpacking and smaller file sizes. Blog Post Web Platform: The attribute values which indicate the coordinates of PointerEvent may now be fractional values rather than only integers. This allows web apps to handle the events with higher-precision coordinates when the target element is transitioned by CSS and/or the viewport is zoomed. The behavior of mouseenter, mouseleave, pointerenter and pointerleave events was changed for improved spec compliance when the last mouseover or pointerover event target is removed. Added support for the WebAuthn getClientCapabilities() method. |
| Firefox 134.0 Jan 7, 2025 |
Fixed the missing scrollbar in the Library window, such as when viewing History or Bookmarks. (Bug 1934482) Fixed a problem where toolbar buttons were not visible on mouseover when using both the Windows High Contrast theme and the Firefox System theme. (Bug 1930840) Fixed blurry line drawing on some Canvas elements when hardware acceleration is enabled. (Bug 1933668) Fixed incorrect Firefox window positioning on Windows when restoring from maximized. (Bug 1934238) |
| Firefox 133.0.3 Dec 10, 2024 |
New: Firefox now supports touchpad hold gestures on Linux. This means that kinetic (momentum) scrolling can now be interrupted by placing two fingers on the touchpad. HEVC hardware support is implemented for Windows users. Fixed: Fixed an issue that started with macOS Sonoma where the emoji picker would open and immediately close when opened with the Cmd+Ctrl+Space shortcut. Thanks to research by Carlos Duarte do Nascimento (Chester) and :bintoro, and a patch by Carlos Duarte do Nascimento (Chester), we have been able to fix this universally for this shortcut and similar shortcuts going forward. Fixed an issue that started with macOS Sonoma where the emoji picker would also insert the character "e" in the selected text field/box when opening the emoji picker using the Fn+e shortcut. We have also fixed this for similar shortcuts using the Fn key. Changed: Firefox follows now the model HTML specification for transient user activation more closely. This change makes popup blocking less strict in cases where previous versions of Firefox were overly aggressive, reducing erroneous blocking prompts. |
| Firefox 133.0 Nov 25, 2024 |
Fixed possible errors when playing encrypted media content through some streaming providers. (Bug 1929491) Added a mitigation to help reduce the frequency of duplicated push notifications reported by some users. (Bug 1928868) Fixed hangs when printing from some sites when using the system print dialog. (Bug 1898184) Fixed a crash which could occur when using Microsoft SSO on macOS. (Bug 1929622) Fixed a crash in the Network Monitor developer tool which could occur in some circumstances. (Bug 1924882) |
| Firefox 128.4.0 Nov 18, 2024 |
Fixed: Various security fixes and other quality improvements. |
| Firefox 132.0.2 Nov 12, 2024 |
New: Microsoft PlayReady encrypted media playback is now being rolled out to select sites on Windows. Through this support, we are gradually rolling out a 1080p baseline and 4K Ultra HD support with key streaming partners. An added benefit is that viewers get less battery drain and better performance when streaming their favorite movies and shows. Wide Color Gamut WebGL is now available for Windows and macOS users! With this support, Firefox is bringing a richer, more vivid range of colors to the videos, games, and images on your screen. This implementation currently supports wider color (P3) profiles in 8-bit. WebRender hardware accelerated rendering is now enabled for most SVG filter primitives, improving performance for certain graphics-heavy content. Accelerated filters are feBlend, feColorMatrix, feComponentTransfer, feComposite, feDropShadow, feFlood, feGaussianBlur, feMerge and feOffset. Added support for macOS’ new screen and window sharing selection features on macOS 15 and later. Support for macOS 14 will be added in a future release. The macOS session resume feature has been enhanced. Firefox will now automatically relaunch if it was open before a system restart, like after an OS update. Firefox now blocks third-party cookie access when Enhanced Tracking Protection's Strict mode is enabled. Fixed: Various security fixes: CVE-2024-10458: Permission leak via embed or object elements CVE-2024-10459: Use-after-free in layout with accessibility CVE-2024-10460: Confusing display of origin for external protocol handler prompt CVE-2024-10461: XSS due to Content-Disposition being ignored in multipart/x-mixed-replace response CVE-2024-10462: Origin of permission prompt could be spoofed by long URL CVE-2024-10463: Cross origin video frame leak CVE-2024-10468: Race conditions in IndexedDB CVE-2024-10464: History interface could have been used to cause a Denial of Service condition in the browser CVE-2024-10465: Clipboard "paste" button persisted across ta |
| Firefox 132.0.1 Nov 4, 2024 |
New: Microsoft PlayReady encrypted media playback is now being rolled out to select sites on Windows. Through this support, we are gradually rolling out a 1080p baseline and 4K Ultra HD support with key streaming partners. An added benefit is that viewers get less battery drain and better performance when streaming their favorite movies and shows. Wide Color Gamut WebGL is now available for Windows and macOS users! With this support, Firefox is bringing a richer, more vivid range of colors to the videos, games, and images on your screen. This implementation currently supports wider color (P3) profiles in 8-bit. WebRender hardware accelerated rendering is now enabled for most SVG filter primitives, improving performance for certain graphics-heavy content. Accelerated filters are feBlend, feColorMatrix, feComponentTransfer, feComposite, feDropShadow, feFlood, feGaussianBlur, feMerge and feOffset. Added support for macOS’ new screen and window sharing selection features on macOS 15 and later. Support for macOS 14 will be added in a future release. The macOS session resume feature has been enhanced. Firefox will now automatically relaunch if it was open before a system restart, like after an OS update. Firefox now blocks third-party cookie access when Enhanced Tracking Protection's Strict mode is enabled. Fixed: Various security fixes: CVE-2024-10458: Permission leak via embed or object elements CVE-2024-10459: Use-after-free in layout with accessibility CVE-2024-10460: Confusing display of origin for external protocol handler prompt CVE-2024-10461: XSS due to Content-Disposition being ignored in multipart/x-mixed-replace response CVE-2024-10462: Origin of permission prompt could be spoofed by long URL CVE-2024-10463: Cross origin video frame leak CVE-2024-10468: Race conditions in IndexedDB CVE-2024-10464: History interface could have been used to cause a Denial of Service condition in the browser CVE-2024-10465: Clipboard "paste" button persisted across ta |
