I personally don't see much difference between Firefox's current UI, it's a fucking browser, it has tabs and a menu. On the extensions side, there's no Vimium, no open in mpv, no keepassxc extension, no don't accept webp. Has a dev who decided to block AdNauseam. And Firefox's spyware can be disabled. Now on top of that it also renders sites worse, so I don't really see why would I ever use that. At this point Pale Moon is basically Mozilla-lite.