title: Get POST response data within Greasemonkey script
body: <p>I want to get reponse data send by a Jetty Server via POST within a Greasemonkey script.</p>
  
  <p>New data is send every few seconds.</p>
  
  <p>How can I directly access the data, that is displayed in Firebug "Network" tab as response data? 
  (I tried to get the data with solutions provided here that make use of jQuery and ajaxSuccess, but that did not work. And I am not sure if the POST data is returned from an jQuery ajax request. So is there a way to directly access the POST "stream").</p>