title: Is there extension for safari to switch User Agent automatically for specified sites
body: <p>I am looking for an extension or plugin that will send the iPad User Agent String when I view CNN, Facebook, Youtube, Vimeo so that I get HTML5 content instead of Flash content.</p>
  
  <p>I am aware of the functionality to manually change the User Agent through the develop menu and looking for something that will do it automatically every time I visit certain websites.</p>