Sidebar tabs are great but how do I get rid of the top bar tabs, i.e., with the red/yellow/green "traffic light" controls
to the left of the Go back/forward controls?
Peace
--Devon
P.S. Is some obstacle so big I should abandon Firefox and switch to Vivaldi?
https://jovi.net/TST shows the bad Firefox layout.
P.P.S. Your quiz makes no sense, shouldn't it instead say 英語で「レインボー」とは何ですか？ （小文字7文字）