Except where noted, everything here applies to both Firefox 84 and the Firefox 78.6 ESR.

Bug fixes

• The WebsiteFilter did not block viewing the source of blocked websites. This was fixed in bug 1465847.

• In some cases, if there was an error installing an extension via policy, other extensions wouldn't install. This was fixed in bug 1674006.

• On Windows, the uninstaller no longer asks for UAC permission it's not needed. This was fixed in bug 1639613.

Policies

• The Preferences policy has been updated to support preferences that begin with spellchecker. and pdfjs..