Redesigned extensions dashboard in about:addons provides easy access to information about your extensions, including data and settings access required by each extension.
Find high quality, secure extensions via the Recommended Extensions program in about:addons, which now displays user count and ratings for each extension. "Recommended” badges for these extensions also appear on AMO. More extensions will be added over time.
Cryptomining and fingerprinting protections are added to strict content blocking settings in Privacy & Security preferences.
WebRender will roll out to Windows 10 users with AMD graphics cards.
Windows Background Intelligent Transfer Service (BITS) update download support, which allows Firefox update downloads to continue when Firefox is closed.
Local files can no longer access other files in the same directory.
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.
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.