file_bug1769155.html

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<html>

  <head>

    <script>

      addEventListener("pageshow", () => {

        // Let's unblock the synchronous XHR in the opener.

        let xhr = new XMLHttpRequest();

        xhr.open("GET", "bug1769155.sjs?stop", false);

        xhr.addEventListener("load", () => {

          opener.postMessage("redirectDone", "*");

});

        xhr.send();

});

    </script>

  </head>

</html>