file_restricted_frame.html

Enable keyboard shortcuts

<!DOCTYPE html>

<html>

<head>

<title>not restricted</title>

</head>

<body>

  <iframe id="frame"></iframe>

  <script>

    const documentURL = URL.parse(document.URL);

    let frameHost = documentURL.searchParams.get("host");

    if (!frameHost) {

      frameHost = documentURL.host;

    const frame = document.getElementById("frame");

    frame.src = `https://${frameHost}/browser/toolkit/content/tests/browser/file_restricted.html`

  </script>

</body>

</html>