There's only one competitor, apple, and also, I don't think that firefox mobile is that good. It's better than chrome, and I'm using it, but I don't know why would a device with 12gb of ram, a high-res display, a processor that can run warzone can't run the normal version of firefox with a different ui. I think it just splits development, and I don't like how it's always behind in development, and how it lacks features.