Difficult to install and completely glitched. I recommend Zen Browser, which is a fork of Firefox with Arc UI.

He automatically deleted all my pages
Now hundreds of my pages have been deleted by this terrible plugin
My hard work, my everything..............

Very nice app, makes firefox behave very similiar.

Very limited

Cara valeu pelo addon, eu adoro esse layout e funções do arc mas não tem como deixar o firefox para trás, estou ansioso pros proximos updates

It is really nice, works like a charm, reminds me of my Vivaldi setup but i do like an occasional Chromium break, and this delivers. Its almost like a standalone browser but its honestly even better off being a mod on Firefox, Zen browser is nice and all but it feels clunkily connected to my main firefox account while arcfox runs literally ON Firefox itself. Really nice overall, i do recommend giving it a try!

Very nice extention, exactly what I was looking for a total Firefox UI overhaul. Would love it even more if it had autohide and a button to access settings and extentions if thats even possible.
Great work.