Steve Jobs was able to do that with Apple. There is no reason to believe that is not possible with Mozilla. Especially taking into consideration that Mozilla doesn't have to be profitable as a company. Being sustainable would be enough.
Steve Jobs didn't do it alone, there was huge trend transforming all of the music industry, with piarted MP3's over P2P networks, and he rode it, and did so exceptionally well.
What trend should Firefox ride ? And how will it keep that project a secret for long enough, Given that it's all open-sourced ?