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.

3. Uses Gaia UI

Firefox OS features a UI code-named Gaia: Icons representing Web apps are pinned onto a home screen interface which you can swipe through horizontally. It includes a phone dialer. All of this is written in HTML5, including this dialer. Mozilla is designing its OS so that Gaia's essential tools will work offline without the need for a live Internet connection -- the HTML5 code for them would be cached onto the mobile device.

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