That's not entirely true, it also works in apps that embed safari (e.g. twitter's in-app browser). I didn't see any ads in a quick test with Firefox on iOS, bu

That's not entirely true, it also works in apps that embed safari (e.g. twitter's in-app browser). I didn't see any ads in a quick test with Firefox on iOS, but maybe that was Firefox's tracking protection, not a content blocker.