From calcanis.com:
Firefox made $72M last year and is on target to have 120 employees this year. Mozilla Corporation makes all that money because of the Google Search box on the top right. If you search with that box (which I do all day long) and you click on the Google ads on the results page Firefox gets ~80% of that. They also have Amazon in the search box, and other services that I'm sure kick them back some affiliate fees.
