Firefox Beta and Developer Edition
Release Notes

Release Notes tell you what’s new in Firefox. As always, we welcome your feedback. You can also file a bug in Bugzilla or see the system requirements of this release.

Firefox Beta — English (US)

Your system may not meet the requirements for Firefox, but you can try one of these versions:

Firefox Beta — English (US)

Firefox Beta is no longer supported on Windows 8.1 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Firefox Beta is no longer supported on macOS 10.14 and below.

Please download Firefox ESR (Extended Support Release) to use Firefox.

Version 92.0beta, first offered to Beta channel users on August 10, 2021

Firefox now supports automatically performing HTTPS upgrades when HTTPS RR is available and using HTTPS RR as Alt-Svc headers.
Firefox now supports the new AVIF image format, which is based on the modern and royalty free AV1 video codec. It offers significant bandwidth savings for sites compared to existing image formats. Additionally it supports transparency and other advanced features.
Mac users can now access the MacOS share options from the Firefox File menu.
Support for images containing ICC v4 profiles is enabled on macOS.