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    How to Quit a XUL Application

    Script can attempt to quit a XUL application, or force the application to quit, using the nsIAppStartup interface.

    <script>
    function quit (aForceQuit)
    {
      var appStartup = Components.classes['@mozilla.org/toolkit/app-startup;1'].
        getService(Components.interfaces.nsIAppStartup);
    
      // eAttemptQuit will try to close each XUL window, but the XUL window can cancel the quit
      // process if there is unsaved data. eForceQuit will quit no matter what.
      var quitSeverity = aForceQuit ? Components.interfaces.nsIAppStartup.eForceQuit :
                                      Components.interfaces.nsIAppStartup.eAttemptQuit;
      appStartup.quit(quitSeverity);
    }
    </script>
    

    Calling this function if there is an uncaught exception, to force the application to quit:

    <script>
    try {
      doSomething();
    }
    catch (e) {
      quit(true);
    }
    </script>
    

    The "Quit" menuitem should typically prompt the user if there is unsaved data:

    <menuitem label="Quit" oncommand="quit(false);"/>
    

    Document Tags and Contributors

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    Contributors to this page: BenjaminSmedberg, StM, Mgjbot
    Last updated by: Mgjbot,