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diff --git a/docshell/test/mochitest/test_bug634834.html b/docshell/test/mochitest/test_bug634834.html
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index 0000000000..4c706eeec0
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+++ b/docshell/test/mochitest/test_bug634834.html
@@ -0,0 +1,51 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=634834
+-->
+<head>
+  <title>Test for Bug 634834</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.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=634834">Mozilla Bug 634834</a>
+
+<script type='application/javascript'>
+SimpleTest.waitForExplicitFinish();
+
+function iframe_loaded() {
+  var loadedAfterPushstate = false;
+  $("iframe").onload = function() {
+    loadedAfterPushstate = true;
+  };
+
+  var obj = { name: "name" };
+  obj.__defineGetter__("a", function() {
+    $("iframe").contentWindow.location = "http://example.com";
+
+    // Wait until we've loaded example.com.
+    do {
+        var r = new XMLHttpRequest();
+        r.open("GET", location.href, false);
+        r.overrideMimeType("text/plain");
+        try { r.send(null); } catch (e) {}
+    } while (!loadedAfterPushstate);
+  });
+
+  try {
+    $("iframe").contentWindow.history.pushState(obj, "");
+    ok(false, "pushState should throw exception.");
+  } catch (e) {
+    ok(true, "pushState threw an exception.");
+  }
+  SimpleTest.finish();
+}
+
+</script>
+
+<iframe id='iframe' src='file_bug634834.html' onload='iframe_loaded()'></iframe>
+
+</body>
+</html>