I don't think this is a browser extension, because Mobile Firefox is (AFAIK) the only browser on Android that supports extensions. This would have to block http

I don't think this is a browser extension, because Mobile Firefox is (AFAIK) the only browser on Android that supports extensions. This would have to block http connections or something, which would seem to be breaking the rule that Google claims it is. I also think people should be able to run whatever they want on their phone, but I do understand the Android model of "apps should not touch one another", and pulling apps that don't follow that from the app store is at least somewhat understandable. You can always side load...and if you're running adblock, you're probably more ok with things like that. On the other hand, just getting an app that sets the equivalent of a hosts file should be ok for an official app store... The real solution for adblock in particular is for Mobile Chrome to add support for extensions. Or use Firefox which already has support.