To be accurate though, Mozilla has a lot more leverage there any of the analogs you mention. Mozilla isn't getting handouts from Google. They probably deliver

To be accurate though, Mozilla has a lot more leverage there any of the analogs you mention. Mozilla isn't getting handouts from Google. They probably deliver more revenue to Google by setting it as the default search than any other partner Google has. iOS/mobile Safari is probably the only other contender. Finding ways to diversify is good, though.