--- a/dom/base/test/test_noAudioNotificationOnMutedElement.html
+++ b/dom/base/test/test_noAudioNotificationOnMutedElement.html
@@ -34,18 +34,17 @@ var audio = new Audio();
 audio.loop = true;
 
 var tests = [
   function() {
     observerService.addObserver(observer, "audio-playback", false);
     ok(true, "Observer set");
 
     audio.src = "audio.ogg";
-    // Wait for the audio metadata to become available so that we have an audio track.
-    audio.onloadedmetadata = runTest;
+    runTest();
   },
 
   // Verify that muting and unmuting dispatches the events as expected.
   function() {
     expectedNotification = 'active';
     audio.play();
   },
 

--- a/dom/base/test/test_noAudioNotificationOnMutedOrVolume0Element.html
+++ b/dom/base/test/test_noAudioNotificationOnMutedOrVolume0Element.html
@@ -34,18 +34,17 @@ var audio = new Audio();
 audio.loop = true;
 
 var tests = [
   function() {
     observerService.addObserver(observer, "audio-playback", false);
     ok(true, "Observer set");
 
     audio.src = "audio.ogg";
-    // Wait for the audio metadata to become available so that we have an audio track.
-    audio.onloadedmetadata = runTest;
+    runTest();
   },
 
   // Verify that unmuting when the volume is 0 doesn't dispatch the events.
   function() {
     expectedNotification = 'active';
     audio.play();
   },