Mozilla, best known for its Firefox browser and operating system, has lost the man responsible for the core technologies of both products.roject to keep Firefox competitive with browsers like Google's Chrome. His departure is part of major changes Mozilla faces with Firefox OS. While Gal is moving into a new market, a new competitive threat is arriving. Mozilla's former president, Li Gong, is at work on another startup nicknamed Gone Fishing that's building a mobile operating system relying on the same Web-based approach Firefox OS uses, CNET has learned. Gong was the Firefox OS business leader before being promoted to...