OP overstated his case, but the fact is that the Mozilla Foundation does derive the majority of its revenue from deals with advertising based companies. Wheth

OP overstated his case, but the fact is that the Mozilla Foundation does derive the majority of its revenue from deals with advertising based companies. Whether or not it would exist (or if it existed, in what form?) without these deals is a critical but unanswered question. Critical in the sense that it goes to the heart of whether we can be both ad-free and have free stuff like Firefox.