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.

84.0beta Firefox Beta

November 17, 2020

Version 84.0beta, first offered to Beta channel users on November 17, 2020

New

  • WebRender is now enabled by default on Linux/GNOME/X11.

  • Includes native support for Apple Silicon hardware.

  • Firefox 84 will be the final release to support Adobe Flash. There will be no setting available to re-enable Flash support in future releases. More information

Changed

  • New profiles will load all of Mozilla's trusted intermediate certificate authorities from Remote Settings in a single day now, rather than spread out over multiple weeks. This makes it much more likely that a new Firefox user will not encounter security errors on misconfigured websites.

Developer

Unresolved

  • macOS users running Cylance antivirus software may see their Firefox installation get corrupted due to being erroneously flagged as malware.

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All Firefox Beta downloads