[FeepingCreature]

> Better browser UX, in my strongly-held opinion, starts with vertical tabs. With horizontal tabs, you can have maybe 6 to 8 tabs open before things tabs get difficult to manage or track.

TabMixPlus! Dynamic width vertically scrollable fully customizable multirow tab bar. I have 50 tabs open, 22 on screen, and perfect overview. It still technically runs on current Firefox, but you have to engage in some very vigorous modding. See the README https://github.com/onemen/TabMixPlus but be aware that this will completely disable extension signature validation. (I blame Mozilla.)

[SSLy]

I think Sideberry is nowadays more comfortable than TMP.