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by uglycoyote 3145 days ago
I asked this exact question on Stack Overflow earlier today and found that someone else had already also asked it and got an answer.

https://superuser.com/questions/1261660/firefox-quantum-ver-...

(basically, hacking some CSS rules by creating a file in your AppData directory, so that the top bar is hidden)

Incidentally, I also discovered that Tree Style Tab's settings page under Firefox has a nice little box where you can configure the CSS it uses, which was nice because I prefer it with a smaller font and less padding.