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Thanks for this tip! Private browsing mode causes the tab bar to reappear (though the tabs are still hidden), so I found that the selector #TabsToolbar works ev

• mannigfaltig 9y ago
  I've added a modification that removes any margin at the top: #TabsToolbar, #sidebar-header { visibility: collapse !important; } #TabsToolbar { margin-bottom: -21px !important; } Then go to the hamburger menu > Customization and check "Title Bar" at the bottom left. Then it pretty much looks like FF 56. I've also changed the style of TSTs in the add-on settings (all the way at the bottom; not in userChrome.css) such that the tabs don't take up as much vertical space and to hide the close box button (and only show it on the mouse-over event): .closebox { display: none } .tab:hover .closebox { display: block; } .tab { padding-top: 0px; padding-bottom: 0px; } You can make `.tab` even tighter: .tab .icon { padding-top: 2px; /* reducing it by 2px */ padding-bottom: 2px; } :root { --tab-height: 22px; /* reducing it by 4px */ }