Firefox Beta and Developer Edition
Release Notes

Increased content processes to 8

Added capability to search through open tabs from the tab overflow menu

New backend for the storage.local WebExtensions API, providing I/O performance improvements when the extension updates a small subset of the stored data

WebExtension keyboard shortcuts can now be managed or overridden from about:addons

Improved scrolling behavior: Firefox will now attempt to keep content from jumping around while a page is loading by supporting scroll anchoring

New about:privatebrowsing with search

Basic macOS touchbar support

A certificate error page now notifies the user of the name of the certificate issuer that breaks HTTPs connections on intercepted connections to help troubleshooting possible anti-virus software issues.

Fixed an performance issue some Linux users experienced with the Downloads panel (bug 1517101).

Firefox now blocks all autoplay media with sound by default. Users can add individual sites to an exceptions list or turn the blocking off.

System title bar is hidden by default to match Gnome guideline

It is now possible to select new elements in the page while the debugger is paused

JavaScript getters can now be executed from the auto-completion popup in the WebConsole

window.alert()/prompt()/confirm() now works again in Responsive Design Mode