Playing sound from chrome scope

Add-ons Development
#1 
function audioContextCheck() {
    if (typeof Services.appShell.hiddenDOMWindow.AudioContext !== 'undefined') {
        return new Services.appShell.hiddenDOMWindow.AudioContext();
    } else if (typeof Services.appShell.hiddenDOMWindow.mozAudioContext !== 'undefined') {
        return new Services.appShell.hiddenDOMWindow.mozAudioContext();
    } else {
        throw new Error('AudioContext not supported');
    }
}

var pth = OS.Path.join(OS.Constants.Path.desktopDir, 'zirzir.mp3')
OS.File.read(pth).then(valRead => {
    console.log('valRead:', valRead);
    var myAudioContext = audioContextCheck();
    //myAudioContext.decodeAudioData(valRead, function(buffer) {
        var audioBuffer = valRead;
        var playSound = myAudioContext.createBufferSource();
        playSound.buffer = audioBuffer;
        playSound.connect(myAudioContext.destination);
        playSound.start(myAudioContext.currentTime);
    //})
});

If you have a file on your desktop named zirzir.mp3 this works. But i rely on hiddenDOMWindow, does anyone know how to do this without hiddenDOMWindow to access AudioContext?

#2

This code is simpler and it works:

new Services.appShell.hiddenDOMWindow.Audio(OS.Path.toFileURI(OS.Path.join(OS.Constants.Path.desktopDir, 'zirzir.mp3'))).play()

Same issue though, how to get Audio without hiddenDOMWindow? Anyone know?