title: change POST url on the fly during HTTP request in Firefox
body: <p>I would like to change url the HTTP POST to during the request in firefox. Currently I have tried "Tamper Data" firefox addon which allows me change POST parameters but not the POST request url during the request. </p>
  
  <p>I don't want to mimic the post by curl etc as I have to manually setup the cookie and parameters all that.  </p>
  
  <p>Is there such thing available in firefox? </p>
  
  <p>thanks!</p>