According to its recent most financial statement, the Mozilla Corporation, responsible for Firefox and Thunderbird development, makes 84 percent of its revenue from a search partnership with Google. All new installations of Firefox use Google as the default search engine, and most of Mozilla's revenue comes from that arrangement and similar deals with Microsoft and other search partners. The Google partnership was set to expire this November, but there's been no word from either Microsoft or Google as to whether it's been "reassessed."
In response to our questions about the future of a Google and Mozilla partnership, a Google spokesperson told us, "We generally don't disclose specific terms of business agreements. We can confirm that we still have an agreement with Mozilla, but have nothing new to share at this time." ZDNet's Ed Bott received a similarly vague response from Mozilla PR.