file_bug1743353.html

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  <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", () => {

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            window.addEventListener("unload", () => {

              bc.postMessage("unload");

              bc.close();

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            history.back();

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          case "close":

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            window.close();

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