Here is a pre-configured set of settings for Aris-t2's CSS mod:https://github.com/macrogreg/CustomCSSforFx/pull/1It sets up multi-row tabs with fixed with. See screenshot on the linked page.
I use https://github.com/Aris-t2/CustomCSSforFx . It's a great repo, but because it has so many things it can do, and because multi-row-tabs are supported well, but are turned off by default, I only pull it when Mozilla breaks me, which is regular, ...
I second that. Multi-row tabs is a key differentiating factor, and Mozilla keeps breaking it every few releases. Please, make multi-row tabs a first-class citizen!
Same here.Honestly, the ability to get multi-rows is a key reason that I am loyal to Firefox, and they are working really hard on getting me to move to a different browser. Add it as a first-class feature!