I use Firefox as my main browser and it is fine. People complain because it is not Chrome, that is all. It is a shame, because the last remnants of the open web will soon be gone, and with them any sort of user control over their computing environments, namely the ability to block intrusive ads and the various other mechanisms of surveillance capitalism. But I guess it will all be worth it because something was off by 1px on Firefox or it lacked "polish" or whatever...