shells/browser/shared/popups/disabled.html

<script src="shared.js"></script>
<style>
  html,
  body {
    font-size: 14px;
    min-width: 410px;
    min-height: 33px;
  }

  body {
    margin: 8px;
  }

  hr {
    width: 100%;
  }
</style>
<p>
  <b>This page doesn&rsquo;t appear to be using Relay.</b>
</p>