Not a fan of the detached button look? There's a temporary preference in Firefox 89 to revert most of the tab bar changes. After Firefox 89, you'll be able to use custom style rules in a userChrome.css file to restyle the tab bar. We can come back to that next month. (1) In a new tab, type or paste '''about:config''' in the address bar and press Enter/Return. Click the button accepting the risk. (2) In the search box in the page, type or paste '''browser.proton.enabled''' and pause while the list is filtered (3) Double-click the preference to switch between '''true''' (new UI) and '''false''' (old UI) This preference was retained only for testing and might be a touch glitchy, but give it a try and let us know how it goes.