Edge on both Android and iOS has Adblock built in and Safari on iOS can have ad blocking very easily enabled with a content blocking app like AdGuard. Firefox is arguably harder to set up for ad blocking than either of these.
If AdBlock is a built-in feature in Edge on Android, I assume you still need to opt-in through the settings (e.g., Settings -> Enable AdBlock), no? In which case the setup is Firefox is similarly easy: Addons -> uBlock Origin. Perhaps a bit less intuitive for an average user, but still very straight-forward to set up.