You're completly ignoring that there are other users than you who have different software needs. I use Firefox still because I use RSS feeds a lot, do not like using a dedicated app for them, and find Firefox to be the only browser with a good UI for RSS feeds. (the drop down menus in the bookmarks toolbar, its heaven for keeping tabs on a lot of feeds) I also find that adblocking on Firefox works better than on Chrome or Safari. As for iOS, I have no use for Firefox there. I use Safari frequently in macos as well, so I'm not biased towards liking one piece of software more than the other. Safari runs a lot smoother, especially with video, on macos than firefox does. In the end all the browsers are so damn close that it's all just small differences.