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I’m saying this as a 2 year convert Firefox user: mostly easily replaceable. Sure, I can browse pretty much every page that I can on chrome. However, a few sites don’t work the same way - sometimes because of the site’s conscious decision, sometimes because of Firefox.
Take Facebook, for example. On desktop, I can’t make voice calls anymore from the desktop site. For a while it was possible with non encrypted chats, but now pretty much all of them are encrypted, and FF is not compatible with that. I also can’t watch h265 videos in my chats anymore. I’m still sticking with FF, but I just can’t easily say that FF is just as good for everything (I’m still not going back to chrome).
Now I’m jealous! Back when I was a kid, I loved it on C64 and pressed every single button to find some secret two player mode.