Firefox tab less

We can customize Firefox interface to hide the tabs bar :

1. First, we have to tell Firefox that we want to customize its interface.

   In the address bar, type about:config and accept the risk message.

   Then, look for a key named toolkit.legacyUserProfileCustomizations.stylesheets

   Change its value to true.

2. Look for the profile folder

   To show all profiles used in Firefox :

   cat ~/.mozilla/firefox/profiles.ini
   

   The profil name has letters and numbers, generally you are looking for the one with the word default in it.

   Go inside this folder et create a chrome folder :

   mkdir chrome
   

   Inside this chrome folder, edit a new file named userChrome.css with this content :

   1#TabsToolbar {
   2    display: none !important;
   3}
   

3. Restart Firefox !