Mozilla launched its first Firefox OS Simulator late last year, letting developers test out apps on the new platform even though the software was still very much in development. It only makes sense, then, that a new version would surface following the mobile operating system's official unveiling at Mobile World Congress 2013. Like versions 1.0 and 2.0, Firefox OS Simulator 3.0 runs as an extension in Mozilla's browser and is available on Linux, Windows and OS X. The new pr
