I have the following code running in system:

    var _iv;

    navigator.requestWakeLock('cpu');
    navigator.requestWakeLock('screen');
    navigator.requestWakeLock('wifi');

    window.on('online', () => {
      _iv = setInterval(ping, 1500);
    });
    window.on('offline', () => clearInterval(_iv));

    function ping() {
      var x = new XMLHttpRequest({ mozSystem: true });
      x.open('GET', 'http://janjongboom.com/yolo123?' + (+new Date));
      x.send();
    }

When I now turn off the screen via |navigator.mozPower.screenEnabled = false| 
it will stop executing my code anyway (need to not be connected to USB). It 
also does not show up anymore in ADB when I re-plug it into USB...

What am I missing?
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