dom/tests/mochitest/bugs/bug346659-opener-echoer.html


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<script>
  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  window.opener.opener.postMessage(window.opener.testNum + " - " + window.x, "http://mochi.test:8888");
  window.opener.close();
  window.close();
</script>