Loading LoadingThis feature is currently in (as of mid-2026) and represents the most significant UI change to Firefox's chrome since Proton.
This feature is evolving rapidly. For latest status, follow Firefox Nightly release notes or the #sidebar-revamp channel on Mozilla’s Matrix. firefox sidebar.revamp
If the options are missing or you want to force the classic look, you can use the internal configuration editor: Type about:config in the address bar and press Enter. Search for . This feature is currently in (as of mid-2026)
Here is the full content breakdown of the redesign, including its features, the new tools included, and how to enable or customize it. including its features