My understanding is that Firefox on iOS is substantially limited from Windows and Android. Like they can only run uBlock Origin Lite and many add-ons aren't available. Something about Apple policy blocking browser extensions that can run scripts/code, as it might compete with Apple's app store. But that's just what I've read online from other people. It also might be somewhat different recently in the EU, at least about the installing alt app stores. As I said, I haven't used an iOS device in over a decade, so have no first hand knowledge.