Use Tree Style Tabs Instead of the Default Tab Bar in Firefox
UPDATE: Firefox has added this in version 136, check this post, and ignore what’s below lol.
First install Tree Style Tab plugin.
Now for the tab hiding part:
- Go to your profile directory, directory’s path can be found by going to about:support and open the Profile Directory
- Create a directory called
chrome
- Create a file called
userChrome.css
- Put these in the file
#TabsToolbar {
visibility: collapse;
}
- Go to about:config and set
toolkit.legacyUserProfileCustomizations.stylesheets
to true - Restart Firefox to see the changes