diff --git a/demos/gum.html b/demos/gum.html
index 2e98c29..ecc680d 100644
--- a/demos/gum.html
+++ b/demos/gum.html
@@ -41,7 +41,9 @@ function init() {
     navigator.getUserMedia({video: true, audio: true }, successCallback, errorCallback);
     function successCallback(stream) {
       window.stream = stream;
-      if (window.webkitURL) {
+      if ('mozSrcObject' in video)
+        video.mozSrcObject = stream;
+      } else if (window.webkitURL) {
         video.src = window.webkitURL.createObjectURL(stream);
         // document.querySelector('audio').src = window.webkitURL.createObjectURL(stream);
       } else {
@@ -60,4 +62,4 @@ if (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUs
   article.className = 'supported';
   init();
 }
-</script>
\ No newline at end of file
+</script>