Mozilla certainly aren't doing Google any favours for free. Mozilla Foundation are a penniless open source software distributor but their commercial wing, Mozilla Corporation most definately aren't.
According to this report,
http://www.theregister.co.uk/2006/03...e_mozilla_tax/ Google account for 76% of Mozilla Corp's estimated earning figures of $72m.
Google have made informal complaints to competition authorities around the world regarding IE7's MSN Search integration probably because Microsoft are a bit partial to the odd few hundred million dollar euro fine and believe they have a good chance of getting them in trouble again.
It is case of the pot calling the kettle black.