New
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.
When an HTTPS error caused by antivirus software is detected, Firefox will attempt to automatically fix it
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
WebRender is being enabled on 10 desktops with graphics
Access your Firefox Account settings from the hamburger menu
Added a Firefox shortcut in the Windows 10 taskbar for new installations
Preloading of intermediate TLS certificates is enabled in early beta builds, which avoids error pages in cases of server misconfiguration
Properly support BT601, BT709 and BT2020/2100 colorspaces on all platforms
In addition to providing color contrast information for individual elements of a page, Firefox now offers a full page color contrast audit that identifies all element on a page that fail color contrast checks.
Changed
Unified existing locales (bn-BD, bn-IN) under a single Bengali (bn) localization.
Removed unmaintained languages: Assamese (as), English - South Africa (en-ZA), Maithili (mai), Malayalam (ml), Odia (or). Existing users are migrated to the British English (en-GB) version of Firefox.
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
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