I would like to use Firefox but I still use Chrome as my main browser. Edge, in fact, is my secondary browser (I'm on windows) and I use Firefox last. The speed of Firefox is much better than before but it's appearance is very clunky, enough that this is the main reason I don't use it. There are also other ways the browser seems to lack polish. I don't say this as an attack. I see so many fawning comments about Firefox so I want to give my honest opinion.
A clunky appearance is a fairly subjective statement, could you clarify exactly what about the appearance doesn't work for you? I think that would provide somewhat more useful feedback. (I use Firefox on Windows, and personally don't view it as any more or less clunky than Chrome)