Mozilla's 2005 Revenues ...

... were $53M apparently. Which is quite a hefty hunk of change for a non-profit organization which distributes its products for free.

Most of the money actually comes from deals Mozilla has brokered with Google for making Goog the default search engine in the Mozilla search toolbar. Which just gives you an indication of how much Google must be making and just how much money is out there in the Internet advertising market.