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// on Firefox

navigator.getUserMedia = navigator.getUserMedia ||
                         navigator.webkitGetUserMedia ||
                         navigator.mozGetUserMedia;

if (navigator.getUserMedia) {
   navigator.getUserMedia({ video: true },
      function(stream) {
         console.log("Permission for camera");
      },
      function(err) {
         console.log(err.name);
      }
   );
} else {
   console.log("getUserMedia not supported");
}