title: Reapeat/replay a session x times with a different request header
body: <p>is it possible to reapeat/replay a session x times with a different reaquest header.</p>
  
  <p>I was thinking of a for loop inside <code>OnBeforeRequest</code> which will iterate over the same request from the session, but with a different parameter for the request header ...</p>
  
  <p>But I am kind of lost, can you help me?</p>