- Firefox Nightly 131 introduces vertical tabs and an improved sidebar, enhancing tab management and multitasking for users with many open tabs.
- The vertical tabs feature, similar to Microsoft Edge, keeps tabs organized on the left-hand side and can be customized via Firefox Labs settings.
- Additional features include AI chatbot integration in the sidebar and ongoing development of tab grouping and profile management tools.
Until it re-enables itself like so many toggles in Firefox do after updates.