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diff --git a/dom/media/test/test_multiple_mediastreamtracks.html b/dom/media/test/test_multiple_mediastreamtracks.html
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index 000000000..afc172733
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+++ b/dom/media/test/test_multiple_mediastreamtracks.html
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+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test the ability of MediaStream with multiple MediaStreamTracks</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+  <script type="text/javascript" src="manifest.js"></script>
+</head>
+<body>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+function startTest() {
+  navigator.mediaDevices.getUserMedia({audio:true, video:true, fake:true})
+  .then(function(orgStream) {
+    var a = orgStream.getAudioTracks()[0];
+    var v = orgStream.getVideoTracks()[0];
+    var stream = new MediaStream([a, a, a, a, v, v, v].map(track => track.clone()));
+    var element = document.createElement("video");
+
+    element.onloadedmetadata = function() {
+      is(stream.getAudioTracks().length, 4, 'Length of audio tracks should be 4.');
+      is(stream.getVideoTracks().length, 3, 'Length of vudio tracks should be 3.');
+      SimpleTest.finish();
+    };
+
+    element.srcObject = stream;
+    element.play();
+  })
+  .catch(function(reason) {
+    ok(false, "unexpected error = " + reason.message);
+    SimpleTest.finish();
+  });
+}
+
+SimpleTest.waitForExplicitFinish();
+SpecialPowers.pushPrefEnv(
+  {
+    "set": [
+      ["media.track.enabled", true]
+    ]
+  }, startTest);
+
+</script>
+</pre>
+</body>
+</html>