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diff --git a/dom/base/test/test_bug372964-2.html b/dom/base/test/test_bug372964-2.html
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+++ b/dom/base/test/test_bug372964-2.html
@@ -0,0 +1,58 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=372964
+-->
+<head>
+  <title>Test for Bug 372964</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.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=372964">Mozilla Bug 372964</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 372964 **/
+
+var eventCount = 0;
+
+function runTest() {
+  var ifr = document.getElementsByTagName("iframe")[0];
+  var xhr = new ifr.contentWindow.XMLHttpRequest();
+  xhr.addEventListener("foo", ifr.contentWindow.listener, false);
+  var event = ifr.contentDocument.createEvent("Events");
+  event.initEvent("foo", true, true);
+  xhr.dispatchEvent(event);
+  is(eventCount, 1, "Should have handled an event");
+  ifr.contentDocument.open();
+  ifr.contentDocument.close();
+  event = ifr.contentDocument.createEvent("Events");
+  event.initEvent("foo", true, true);
+  xhr.dispatchEvent(event);
+  is(eventCount, 2,
+     "Should have handled the event because open()/close() keep the active document");
+  ifr.onload = function() {
+    event = ifr.contentDocument.createEvent("Events");
+    event.initEvent("foo", true, true);
+    xhr.dispatchEvent(event);
+    is(eventCount, 2,
+      "Shouldn't have handled an event because the context has changed");
+    SimpleTest.finish();
+  };
+  ifr.contentWindow.location = "about:blank";
+}
+
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(runTest);
+
+</script>
+</pre>
+<iframe src="data:text/html,<script>function listener() { ++parent.eventCount; } </script>">
+</body>
+</html>
+