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from wiki :
Detail :
Company / developer Mozilla Corporation
Programmed in HTML, CSS, Javascript,[1] C++
Supported platforms ARM
Kernel type Monolithic (Linux kernel)
Default user interface Graphical
Official website
http://www.mozilla.org/firefoxos/
Mozilla has finally launched an operating system for smartphones, one whose ascendancy will probably be a slow burn, but could also mark big changes in the way people interact with mobile devices — by ditching a closed “ecosystem.”
Firefox OS for mobile phones is not a walled garden like Apple‘s iOs, Windows Phone or (to an extent) Android. It is based on the open web, which means interacting with many of its HTML5-based apps will be like visiting websites through a browser, opening temporarily as apps, and closing. The phone, in essence, is a browser. Mozilla says Firefox phones will be the world’s first “open web devices.”
source : wiki and forbes sites