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This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.


Provides a means for an app to check whether it is installed. This function is typically called from an origin that hosts an app.


navigator.mozApps.amInstalled( callback )


A callback function; it is called with one argument: an App object if the app is installed, or null if not.

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 Contributors to this page: chrisdavidmills, kohei.yoshino, Sheppy, ethertank, markg, Anant, jswisher
 Last updated by: chrisdavidmills,