Firefox Release Notes

Enhanced performance:

• Faster page rendering with Quantum CSS improvements and the new retained display list feature
• Faster switching between tabs on Windows and Linux
• WebExtensions now run in their own process on MacOS

Convenient access to more search engines: You can now add search engines to the address bar “Search with” tool from the page action menu when on a webpage that provides an OpenSearch plugin

Share links from Firefox for MacOS more easily: You can now share the URL of an active tab from the page actions menu in the address bar

Improved security:

• On-by-default support for the latest draft of the TLS 1.3 specification
• Access to FTP subresources inside http(s) pages has been blocked

A more consistent user experience: Improvements for dark theme support across the entire Firefox user interface

More customization for tab management: added support to allow WebExtensions to hide tabs

Improved bookmark syncing

Various security fixes

The settings for customizing your homepage and new tab page in Firefox have been added to a new Preferences section that can be accessed from Firefox at about:preferences#home. The settings can also be accessed via the gear icon on the New Tab page.

Users with Avast or AVG security software using the HTTPS Scanning feature may get an error message (SSL_ERROR_RX_RECORD_TOO_LONG) when trying to access secure sites. Workarounds are available from this support article until fixed versions of Avast and AVG are available