Much like Microsoft, Mozilla missed out on mobile.<br />Even as its open-source desktop web browser Firefox was surging in popularity, smartphones were starting to emerge as the platform that would push PCs to secondary status for everyday computing.<br />Mozilla said yesterday at its developer conference in Orlando that it will stop selling its Firefox mobile operating system to carriers and cease development of the OS for smartphones.<br />Instead, the company will explore developing Firefox OS for other platforms, such as Internet of Things devices.<br />Meanwhile, power users, long the heart of Firefox’s user base, had plenty of other free and open source mobile operating system options, from the Android variation Replicant to the Linux Foundation-backed Tizen to SailfishOS.