Towards the end of Mozilla’s 2006 Financial statements in the section called “Concentration of Risk” it reads:
“Mozilla has a contract with a search engine provider for royalties. The contract originally expired in November 2006 but was renewed for two years and expires in November 2008. Approximately 85% of Mozilla’s revenue for 2006 was derived from this contract.”
That one source responsible for almost all their revenue was Google. Now if I could choose a partnership to rely on, Google would be at the top of my list. But there are threats – like a plugin called Adblock Plus for Firefox that blocks the very ads that generate their income.