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<!DOCTYPE HTML>
<html>
<head>
  <meta charset="utf-8">
  <script>
    window.addEventListener("pageshow", () => {
      let bc = new BroadcastChannel("bug1743353");
      bc.addEventListener("message", ({ data: cmd }) => {
        switch (cmd) {
          case "load":
            bc.close();
            document.location += "?1";
            break;
          case "back":
            window.blockBFCache = new RTCPeerConnection();
            window.addEventListener("pagehide", () => {
              bc.postMessage("pagehide");
            });
            window.addEventListener("unload", () => {
              bc.postMessage("unload");
              bc.close();
            });
            history.back();
            break;
          case "close":
            bc.close();
            window.close();
            break;
        }
      });
      bc.postMessage("pageshow");
    });
  </script>
</head>
<body>
</body>
</html>