You can hide the tab bar with css: https://superuser.com/questions/1268732/how-to-hide-tab-bar-tabstrip-in-firefox-57-quantum https://superuser.com/questions/12

You can hide the tab bar with css: https://superuser.com/questions/1268732/how-to-hide-tab-bar-tabstrip-in-firefox-57-quantum https://superuser.com/questions/1268732/how-to-hide-tab-bar-...