In Pictures: New Firefox mobile OS

Mozilla officially jumped into the crowded mobile OS field at Mobile World Congress in Barcelona, where the company demonstrated an early version of Firefox OS, which is being developed under the Boot to Gecko project.

1. Built with HTML5

Firefox OS is built entirely with HTML5, and powered by several other open Web standards including CSS and JavaScript. So there won't be APIs specific to this OS that developers need to use to write apps for it. Like for Chrome OS and the Chrome browser, the emphasis will be on encouraging developers to write Web apps that would work on virtually any HTML5-compatible browser, besides Firefox OS.

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