It is based on Linux and written in HTML, JavaScript and CSS, which is an advantage for developers as it does not have to fit the specifications of a particular platform. Making the most of web compatiblityįirefox OS Simulator shows us Mozilla's operating system on our computer. You can download Firefox OS Simulator, which works as an extension for Firefox, and test it yourself. Led by Firefox OS, also known as Boot to Gecko or BG2, it aims to establish itself among tablet and smartphone users. Mozilla has also decided to jump onto the mobile bandwagon and has done so with its own operating system.