I'm pretty sure at least Bing has a revenue sharing program with Mozilla for search results from the search bar (they did as of Firefox 4[1], at least). Google

I'm pretty sure at least Bing has a revenue sharing program with Mozilla for search results from the search bar (they did as of Firefox 4[1], at least). Google just won the auction to be the default. Not sure about the other default search engines, though. [1] http://arstechnica.com/information-technology/2010/10/citing-relevance-mozilla-to-include-bing-in-firefox-4-search-box/ http://arstechnica.com/information-technology/2010/10/citing...