that's a little bit disingenuous. google pays huge amounts of money to Mozilla to be the default search engine because of the huge amounts of money Mozilla users make google by using google services on a daily basis. it's not like they're propping up a competitor just for the hell of it (or even to avoid anti-trust issues).
+1 I donated to Mozilla a few days ago, thinking how small my donation was compared to Google. However, Google must make $$ on Firefox hosted searches.