Firefox OS is a discontinued open source HTML5 based operating system developed for mobile devices by the Mozilla Corporation. Firefox OS was designed to run apps that are implemented in HTML, JavaScript, and CSS

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In this tutorial, you will learn about Firefox OS, devices running Firefox OS available in the market, running FxOS for testing and debugging apps on WebIDE, and making a basic app for FxOS. Finally you will learn how to port existing web applications to FxOS by developing a manifest file.