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dan404 - 11:09 pm on Nov 22, 2008 (gmt 0)
It's no biggie just equal treatment, Firefox is not exclusive to Google in the sense that I read in your comment. There is a difference in user agent: This would indicate it's Yahoo's turn to pay up(for a search query on Yahoo!).
Simply that Yahoo! and Google have a similar arrangement with Mozilla, though not nearly the scale of the financial return that Google provides.
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.4) Gecko/2008102920 YFF3 Firefox/3.0.4