Firefox Developer Edition 121.0 – Official Firefox release channel for experimental builds.

Firefox Developer Edition (was Aurora) is the rapid-fire release channel for the next iteration of the Firefox Web browser. The Developer channel is where users can test the latest features and innovations. Users can expect an increase in polish from the raw, cutting edge features in the nightly builds. These releases may not be as stable as beta or final releases.

With Firefox Developer Edition:

Experience the newest innovations in an unstable environment that’s not for the faint of heart
Provide feedback on features and performance to help determine what makes the final release

Firefox now prompts Windows users to install the Microsoft AV1 Extension to enable hardware decoding support from about:support if not already installed.
Firefox now supports Voice Control commands on macOS systems.
Firefox now allows you to force-underline links in websites. This is useful for people with achromatopsia for example.
On Linux, Firefox now defaults to the Wayland compositor when available instead of XWayland. This brings support for touchpad & touchscreen gestures, swipe-to-nav, per-monitor DPI settings, better graphics performance, and more.
Firefox now includes a floating button to simplify deleting drawings, text, and images added in PDFs.

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