It’s actually kinda simple: they don’t, at least not continuously. It’s “what you use” because you decided that’s true at some point in the past. All you have to do now is decide that some other browser is “what you use”. You can even take it a step further and decide that Chrome is “not what you use”.

(And actually, if you go through with it, you might discover reasons for why you don’t want to switch like “bookmarks” and “saved passwords”. In my opinion, if it is not easy to transfer those things, that is further reason to switch because vendor lock-in is user-hostile.)