The Mozilla Foundation has released a feature update for its Firefox browser in the release channel. Version 121 is rolling out to all users, bringing improved AV1 decoding on Windows, voice control support on macOS, and Wayland support on Linux for better touchpad and touchscreen gestures, improved graphics performance, and more.

Here are the new features mentioned in the Firefox 121 release notes:

Firefox now prompts Windows users to install the Microsoft AV1 Video Extension to enable hardware decoding support for the AV1 video codec from about:support if it is not already installed.

Firefox now supports voice control commands on macOS systems.

On Linux, Firefox now consumes Wayland by default (if available) instead of XWayland. This brings support for touchpad and touchscreen gestures, swipe navigation, per-monitor DPI settings, better graphics performance, and more.

Please note that due to Wayland protocol limitations, picture-in-picture windows require additional user interaction (usually right-clicking on the window) or shell/desktop environment adjustments. See bug1621261, the post on KDE configuration, and the extension on GNOME for related discussion and tracking.

Firefox can now force links to always be underlined. This option can be enabled in the Browsing section of the Firefox settings menu.

The PDF viewer now includes a floating button that simplifies the removal of drawings, text, and images added to PDFs.

Network platform changes:

Support: has() selector. This allows authors to match elements that have or "anchor" at least one element that matches their relative selector.

The text-indentCSS property supports the hanging and each-line keywords, providing more convenient paragraph layout options for bibliography, poetry and other styles.

The text-wrapCSS property supports the balance keyword, which can improve the appearance of short multi-line blocks of text (such as long titles or captions) by coordinating line lengths.

Support lazy loading iframe

Added support for tail call elimination in WebAssembly languages ​​to improve support for functional languages.

In addition, Firefox121 fixes 18 security vulnerabilities, making your browsing safer. You can find the full list of security patches here.

https://support.mozilla.org/en-US/kb/firefox-enterprise-121-release-notes

Developer information is available here:

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/121

Firefox 121 is available on Windows, macOS, and Linux. You can now go to the official website to download the latest Firefox update:

https://archive.mozilla.org/pub/firefox/releases/121.0/

Existing installations will automatically be upgraded to version 121.