Firefoxthunderbird

Autohide Tabbar is a Firefox extension that auto-hides your Firefox browser's tab bar. By moving the mouse to the edge of where the tab bar was, you can make the tab bar show up again. Right click on the tab bar, you can see a menu item of "Autohide Tabbar". Use it to toggle the feature on or... Platforms: Mac

Shows the Firefox/Thunderbird version number in the addon bar (formerly called status bar). It is your responsibility to make the addon bar visible. Use Menu View / Toolbars / Add-on bar. Platforms: Mac