• Bit-Man@lemmy.ml
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    9 months ago

    I’m using vertical tabs since 4 years ago and to do so installed Tree Style Tab (https://tinyurl.com/y5gr4dyn)

    Also has to disable horizontal tabs create or update the file chrome/userChrome.css located at your profile with

    #TabsToolbar {
      visibility: collapse;
    }
    

    and add the setting toolkit.legacyUserProfileCustomizations.stylesheets with value true (use about:config)