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Firefox OS apps are essentially no different to standard websites or web apps. They are built using standard open web technologies — HTML, CSS, JavaScript, etc. — and can be accessed using a web browser. The main differences lie in their ability to be installed on devices and work offline, access to advanced APIs that allow interaction with device features such as camera, gyroscope and address book, and the existence of a solid developer ecosystem — including a Marketplace for distribution of free and paid apps. Generally, they provide users with an "app experience", while still being based on open, cross platform technologies.