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diff --git a/dom/base/test/test_bug675121.html b/dom/base/test/test_bug675121.html
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+++ b/dom/base/test/test_bug675121.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=675121
+-->
+<head>
+  <title>Test for Bug 675121</title>
+  <script type="application/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=675121">Mozilla Bug 675121</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+  
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 675121 **/
+var callbackFired = false;
+var xhrInProgress = false;
+function f() {
+  callbackFired = true;
+  if (!xhrInProgress) {
+    SimpleTest.finish();
+  }
+}
+
+window.requestAnimationFrame(f);
+var xhr = new XMLHttpRequest();
+xhr.open("GET", "file_bug675121.sjs", false);
+xhrInProgress = true;
+xhr.send();
+xhrInProgress = false;
+is(xhr.responseText, "Responded", "Should have a response by now");
+is(callbackFired, false, "Callback should not fire during sync XHR");
+
+if (!callbackFired) {
+  SimpleTest.waitForExplicitFinish();
+}
+</script>
+</pre>
+</body>
+</html>