Think of it as a goodwill deed in time for the holidays. Mozilla said it would keep Google as the default search engine for its Firefox browswer. Financial terms of the deal were not released. Rachel King wrote that Mozilla, a non-profit, relied too heavily on Google search revenue in 2010. The Firefox search box generated between 85% and 90% of Mozilla's revenue in recent years, with Google contributing about 84% of Mozilla's $123 million last year, according to King.