Ivan Tomica

Hide Tab-Bar in Firefox Quantum

When Firefox decided to change the shell of the browser and move to WebExtensions (same format of extensions as used by Chrome) you have not been able to change the interface as you wished anymore via browser extension.

I was using TabMix Plus, and later one Tree Style Tab extensions in order to fit many open tabs and have them all visible at the same time. Before, extensions could automatically disable tab bar for example and minimize vertical space usage.

As you can’t do that anymore the only thing left to do is to change your chrome CSS manually:

Go to the profile directory, on Linux it is:

cd ~/.mozzila/firefox/YOUR_PROFILE/

If chrome directory doesn’t exist, create it:

mkdir chrome

Create file called userChrome.css and add following content:

TabsToolbar { visibility: collapse !important; }

Save the file and restart the web browser

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Sysadmin on the everlasting journey of learning. Always in search for an opportunity to prove myself and to learn something new. My addiction is learning and my main goal is to excel in every aspect of Linux/Unix system administration.

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