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diff --git a/image/test/mochitest/test_bug671906.html b/image/test/mochitest/test_bug671906.html
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+++ b/image/test/mochitest/test_bug671906.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=671906
+-->
+<head>
+  <title>Test for Bug 671906</title>
+  <script type="application/javascript" src="/MochiKit/MochiKit.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/WindowSnapshot.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=671906">Mozilla Bug 671906</a>
+<p id="display"></p>
+<pre id="test">
+<script type="application/javascript">
+
+var first, second, third;
+var correct, val1, val2;
+
+SimpleTest.waitForExplicitFinish();
+
+function snapshotFirst()
+{
+  var iframeelem = document.getElementById('test-iframe');
+  first = snapshotWindow(iframeelem.contentWindow, false);
+
+  iframeelem.onload = snapshotSecond;
+  iframeelem.src = "http://example.com/tests/image/test/mochitest/bug671906-iframe.html";
+}
+
+function snapshotSecond()
+{
+  var iframeelem = document.getElementById('test-iframe');
+  second = snapshotWindow(iframeelem.contentWindow, false);
+
+  // We must have loaded the image again, because the principals for the
+  // loading document are different.
+  [correct, val1, val2] = compareSnapshots(first, second, false);
+  ok(correct, "Image should have changed after changing the iframe's src.");
+
+  iframeelem.onload = snapshotThird;
+  iframeelem.src = "http://mochi.test:8888/tests/image/test/mochitest/bug671906-iframe.html";
+}
+
+function snapshotThird()
+{
+  var iframeelem = document.getElementById('test-iframe');
+  third = snapshotWindow(iframeelem.contentWindow, false);
+
+  // We must have loaded the image again, because the principals for the
+  // loading document are different.
+  [correct, val1, val2] = compareSnapshots(second, third, false);
+  ok(correct, "Image should have changed after changing the iframe's src.");
+
+  // We must have looped back to the first image, because the sjs only sends
+  // one of two images.
+  [correct, val1, val2] = compareSnapshots(first, third, true);
+  ok(correct, "Image should be the same on the third load.");
+
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+<div id="content"> <!-- style="display: none" -->
+<iframe id="test-iframe" src="http://mochi.test:8888/tests/image/test/mochitest/bug671906-iframe.html" onload="snapshotFirst()"></iframe>
+</div>
+</body>
+</html>