Firefox Money: Investigating the bizarre finances of MozillaPayments to nonexistent companies? Mozilla, the Foundation behind the Firefox web browser, is absolutely mammoth — with over One Billion Dollars in assets. One other misconception that many have is that Mozilla’s primary focus is the development of the Firefox web browser. How much money does Mozilla have? According to the Foundation’s 2021 report:“Royalties - Mozilla provides Firefox web browser, which is a free and open-source web browser initially developed by Mozilla Foundation and the Corporation.