You can turn them off. Instructions here, https://superuser.com/questions/1261660/firefox-quantum-ver-57-how-can-i-hide-the-horizontal-tab-bar-with-treesty/126

You can turn them off. Instructions here, https://superuser.com/questions/1261660/firefox-quantum-ver-57-how-can-i-hide-the-horizontal-tab-bar-with-treesty/1261661 https://superuser.com/questions/1261660/firefox-quantum-ver-... works for me: https://i.imgur.com/ZMmJlZT.png https://i.imgur.com/ZMmJlZT.png