title: Using webrequest api with event page
body: <p>When using webrequest api with event page, get the error : </p>
  
  <blockquote>
    <p>The 'webRequest' API cannot be used with event pages.</p>
  </blockquote>
  
  <p>Looking on the net, I found this topic : <a href="http://code.google.com/p/chromium/issues/detail?id=119613">http://code.google.com/p/chromium/issues/detail?id=119613</a></p>
  
  <p>My questions : why can't (or how can) we use both ?</p>