Firefox is deliberately gimped by Apple on iOS, along with every other browser. It's not a fair comparison. It's basically Safari without a ton of extra features that Mozilla was never going to be allowed to implement, which is why the EU decided Apple was being anti-competitive.
Firefox doesn't even need extensions to match Safari, but it does need gecko and all the settings it supports on other platforms.
Apple is a shady company and trusting them with your data is a big mistake.