sandbox_corp_popup.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

  <meta charset="utf-8">

  <title>Popup test page</title>

</head>

<body>

  <p>Popup Page</p>

  <button id="openPopupButton" type="button">Open Popup</button>

  <script>

    document.getElementById("openPopupButton").addEventListener("click", () => {

      window.open(

        "https://example.com/browser/browser/base/content/test/about/sandbox_corp_iframe.sjs?error=inner_coop",

        "_blank"

);

});

  </script>

</body>

</html>