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 83.0beta, first offered to Beta channel users on October 20, 2020

A major update to Firefox JavaScript JITs engine (codenamed Warp) is now activated by default and brings some nice speed improvements. If you find any issues, please file bugs blocking bug 1613592 .
WebRender is now activated on Intel Gen12 GPUs
There is now a "Print selection" context menu item.
Device sharing state indicator icons have been added to the system tray on Windows
Users with touchscreens and precision trackpads can now use pinch gestures on those devices to zoom web content without reflowing
Added an option in about:preferences to disable control of media via keyboard, headset and virtual interface.

Fix for MFSA 2020-49 included in version 83.0b10 and newer.
For users on macOS with minimized windows, Firefox now uses much less power and you should see much longer battery life.

Developer Information
You can now click on the "scroll" badge for scrollable elements to toggle highlighting of the overflow causing elements, which also have a new "overflow" badge next to them