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.

2. Targeted at mobile devices

Unlike Chrome OS, which Google has been developing for lightweight netbooks (so-called Chromebooks), Firefox OS is being designed for mobile devices. Mozilla's developers appear to be focusing for now on getting their OS to work on smartphones first, but it likely won't be difficult for them to re-factor it for tablets.

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