How to hide tab bar while using Tree Style Tab or Tab Center Redux in Firefox
The following post is for Macbook however for windows and linux users steps remains the same. Go to Navigation sidebar with three dashes in the top right corner Click on it. Go to Help Go to Troubleshooting information You get an about:support page. Go To location pointed by Profile Folder - Use Show in Finder for macbook. Now - Create a folder - "chrome" inside that profile folder Create a new file named userChrome.css in chrome folder Paste this content /* hides the native tabs */ #TabsToolbar { visibility: collapse; } /* leaves space for the window buttons */ #nav-bar { margin-top: -4px; margin-left: 74px; margin-bottom: -4px; } Close firefox and reload. Enjoy!