Firefox Beta and Developer Edition
Release Notes

WebRender will roll out to Windows 10 users with AMD graphics cards.

New reporting feature in about:addons allows you to easily report security and performance issues with extensions and themes

Find high quality, secure extensions via the Recommended Extensions program. Look for these vetted extensions in about:addons

Access your Firefox Account settings from the hamburger menu

Added a Firefox shortcut in the Windows 10 taskbar for new installations

Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization.

The following unmaintained translations have been removed: Assamese (as), English - South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or). Existing users will be migrated to the British English (en-GB) version.

When an HTTPS error caused by antivirus software is detected, Firefox will attempt to automatically fix it

The AwesomeBar has been rewritten using Web Technologies only (HTML, JS and CSS). Differences include that results that overflow now have a nice fading effect instead of an ellipsis, and removing history items from the results now requires a different key combination on both Windows and Linux: Shift+DEL or Shift+Backspace

Firefox Developer Tools now offers a full page color contrast audit that identifies all elements on a page that fail color contrast checks.

Added about:compat, where website-specific workarounds are listed and may be toggled. These workarounds are meant as temporary fixes for various forms of website breakage for Firefox, while the website fixes them in due time. With about:compat, it is now easy to see all of the workarounds that are active in Firefox, and easy for website developers to disable a given workaround for testing purposes.