You can currently change your google now provider. Firefox Beta, when installed now, registers an intent for search, and when you next do a google-now swipe-up

You can currently change your google now provider. Firefox Beta, when installed now, registers an intent for search, and when you next do a google-now swipe-up, it'll ask you to pick between google now and firefox beta. Google already has the solution for android of letting apps register intents, even for core things like maps or search or (hell) even the homescreen. Google's solution of letting other apps register intents to handle things and prompt the user, while having default apps made by them that fulfill those intents, seems to be the best compromise on usability and extensibility.