This is not to say that all of Mozilla’s revenue is all coming from Google, but it does appear that most of it certainly is. Other sources appear to include Yahoo, Amazon, eBay amongst other sources not listed.
One thing is for sure though. Mozilla is poised for continued profits despite seeing any recent heat from the browser based competition. Call them too well embedded, perhaps there is something to the law of being first and most popular in the open source browser realm. Whatever the reason, both the status and profits for this browser company are going no where.