That's not something that will happen. Mozilla is not there to monetize stuff that way. They want this stuff to reach everyone. That means free. If a non-user

That's not something that will happen. Mozilla is not there to monetize stuff that way. They want this stuff to reach everyone. That means free. If a non-user-impacting thing can bring money (such as the search deal), then great. If its feature that is only available for subscribers - no way - will never happen.