Mozilla is expanding development of Firefox for Android with new efforts to improve its performance, lower its power consumption, adapt it for tablets--and keep the browser maker relevant in the hottest area of computing.

Firefox is the second-most widely used browser on computers, but things are different in the mobile arena. There, Firefox is at a serious disadvantage compared to mobile browsers such as Apple's Safari and Google's unbranded Android browser that are built into the operating systems.

Mozilla, by comparison, must convince people or phone makers to install Firefox, and even then restrictions keep it off several mobile operating systems.

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