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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=489415
+-->
+<head>
+  <title>Test for Bug 489415</title>
+  <script type="application/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="application/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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=489415">Mozilla Bug 489415</a>
+<p id="display"></p>
+
+<video id="v1" preload="metadata" onended="onendedcb('v1')"></video>
+<video id="v2" preload="metadata" onended="onendedcb('v2')"></video>
+
+<pre id="test">
+<script type="text/javascript">
+SimpleTest.waitForExplicitFinish();
+
+var pushPrefs = (...p) => new Promise(r => SpecialPowers.pushPrefEnv({set: p}, r));
+
+var v1 = document.getElementById("v1");
+var v2 = document.getElementById("v2");
+var count = 0;
+
+function onendedcb(id) {
+  var c = document.createElement("canvas");
+  var ctx = c.getContext("2d");
+  var v = document.getElementById(id);
+  ctx.drawImage(v, 0, 0);
+  try {
+    c.toDataURL();
+    ok(false, "Failed to throw exception in toDataURL for " + id);
+  } catch (ex) {
+    ok(true, "Threw exception in toDataURL for " + id);
+  }
+  if (++count == 2) {
+    SimpleTest.finish();
+  }
+}
+
+function testMixedPrincipals(resource) {
+  // In some OS(XP) can not play mp4. Add this checking for the test failure.
+  if (!resource || !v1.canPlayType(resource.type)) {
+    todo(false, "No types supported");
+    SimpleTest.finish();
+    return;
+  }
+  // Make sure the media cache size(50MB) is large enough that the data could
+  // be download in MediaCache completely.
+  return pushPrefs(['media.cache_size', 50*1024])
+  .then(() => {
+
+    // Generate a random key. The first load with that key will return
+    // data, the second and subsequent loads with that key will return a redirect
+    // to a different origin ('localhost:8888' will be redirected to 'example.org',
+    // and 'example.org' will be redirected to 'localhost:8888'). We rely on the
+    // fact that Ogg will do a seek to the end of the resource, triggering a new
+    // load with the same key which will return a same-origin resource.
+    // Loading data from two different origins should be detected by the media
+    // cache and result in a null principal so that the canvas usage above fails.
+    var key = Math.floor(Math.random()*100000000);
+
+    // In v1, try loading from same-origin first and then getting redirected to
+    // another origin.
+    v1.src =
+        "http://mochi.test:8888/tests/dom/media/test/dynamic_redirect.sjs?key=v1_" +
+        key + "&res=" + resource.name;
+    v1.onloadeddata = function () {
+      // To limit readahead, avoid racing with playback and "catching up" mode.
+      v1.play();
+    }
+
+    // In v2, try loading cross-origin first and then getting redirected to
+    // our origin.
+    v2.src = "http://example.org/tests/dom/media/test/dynamic_redirect.sjs?key=v2_" + key + "&res=" + resource.name;
+    v2.onloadeddata = function () {
+      // To limit readahead, avoid racing with playback and "catching up" mode.
+      v2.play();
+    }
+  });
+}
+
+testMixedPrincipals({ name:"pixel_aspect_ratio.mp4", type:"video/mp4", duration:28});
+
+</script>
+</pre>
+
+</body>
+</html>