Firefox 89 released with new UI
 

I was all set to dislike the new design, but honestly, on Linux – both on Gtk+ and KDE desktops, it looks and feels… Nice? I got used to it in an instant, and everything definitely looks cleaner, tighter, and fresher, without really making any massive changes or doing any truly drastic user interface overhauls.

https://www.osnews.com/story/133503/...d-with-new-ui/