Google and Mozilla have struck a deal that renews their agreement making Google the default search engine in Firefox browsers.

No financial terms were announced, but Mozilla’s blog post says the agreement extends the companies’ agreement “for at least three additional years.”

The renewal comes about three weeks after the previous contract expired. The two companies previously had another three-year deal that expired at the end of November. A couple quotes from the Mozilla announcement:

“Under this multi-year agreement, Google Search will continue to be the default search provider for hundreds of millions of Firefox users around the world,” said Gary Kovacs, CEO, Mozilla.

“Mozilla has been a valuable partner to Google over the years and we look forward to continuing this great partnership in the years to come,” said Alan Eustace, Senior Vice President of Search, Google.

The deal’s importance to Mozilla can hardly be understated. Earlier this year, the company revealed that 98% of its revenue comes from search royalties.

Postscript, December 22: As we’ve reported on Marketing Land, reports are circulating today that the Google-Mozilla is triple the amount that Google spent in 2010 to be the default search engine in Firefox.

Related Topics: Channel: Content | Firefox | Google: Browsers | Google: Partnerships | Top News

About The Author: Matt McGee is Editor-In-Chief of Search Engine Land. His news career includes time spent in TV, radio, and print journalism. His web career continues to include a small number of SEO and social media consulting clients, as well as regular speaking engagements at marketing events around the U.S. He blogs at Small Business Search Marketing and can be found on Twitter at @MattMcGee and/or on Google Plus. You can read Matt's disclosures on his personal blog. See more articles by Matt McGee

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