popup.html

<!DOCTYPE html>
  <head>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:700' rel='stylesheet' type='text/css'>
  </head>
<body id = "Alerts" >
</body>
<script src = "content.js" type="text/javascript"></script>
<script src = "alertloop.js" type="text/javascript"></script>
</html>