Refresh pop-ups are confusing and a bad UX, that's true, but besides that everything works fine. Not to mention that you can install firefox as a flatpak or deb

Refresh pop-ups are confusing and a bad UX, that's true, but besides that everything works fine. Not to mention that you can install firefox as a flatpak or deb, or even just a self updating package from Mozilla if you don't want to learn how to deal with a pop-up that tells you that you need to close firefox for it to be updated.