It works on Firefox on Android as well, as do many other FF extensions. It won't work on a fruit phone [1], the Firefox version you can get there is lobotomised because the fruit factory is afraid a full-feature browser not under their control will eat into their app store margins.

[1] https://support.mozilla.org/en-US/questions/1486487

Yeah I hope Mozilla will make a full version for the EU which is possible now. But Apple is making it as hard as possible for them, there was an article about that only recently.