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Actually the Mozilla Foundation (the non-profit part) owns the Mozilla Corporation (for-profit), the corporation handles all the development.

http://www-archive.mozilla.org/reorganization/

In some ways it is about money, Google pays Mozilla about $300 million a year for search engine placement and click-through ads. That accounts for the vast majority of all of Mozilla's revenue (in 2010, Google paid $115 million and that was 85% of Mozilla's revenue).

That is literally just an implementation detail.

The controlling interest is the nonprofit, the for-profit part exists for tax/etc reasons.

Based on that reasoning, seems like IE should fall into that category too.

It might also help a little that Mozilla depends mostly on Google for revenue :-) ...but google has stated before that basically "anyone in favor of improving the web is on our side"

I think it makes it all the more admirable, though arguably Chrome benefits Google pretty well. They build better apps. You spend more time on their property viewing their ads. They build more HTML5 functionality that makes their ads even more engrossing. They get your homepage, etc.