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I was under the impression (although I have never looked at the code), that Firefox UI is quite inflexible. It is fully functional for me every day and I am not

I was under the impression (although I have never looked at the code), that Firefox UI is quite inflexible. It is fully functional for me every day and I am not missing anything (at least that I know of), but always thought, that it would probably be difficult to change the basics of FF UI. Maybe it is more flexible than I thought? Or they (Floorp) have put it great effort.

PurpleRamen 3y ago
Firefox UI is very flexible, it's mainly just html+css+javascript at this point. But they have greatly removed support for changing through the UI itself over the years. So now you need to to change it through add-ons and hacks (userstyle/userchrome). Floorp seems to build mostly on those hacks and some internal addons of their own.