title: Firebug says "No Javascript on this page", even though JavaScript does exist on the page
body: <p>Why does Firebug say there is <code>No Javascript on this page</code> when there are clearly loads of JavaScript on the page. I even reloaded the page several time to make sure but it still show the same message.</p>
  
  <p>It never used to do that before, but all of a sudden it misbehaves.</p>
  
  <p>Is it because of some configuration issues or because of something else?</p>