title: How to analyse the content of exchanged HTTP data using for Javascript/JQuery apps by using FireFox?
body: <p>I use Firefox to visit some websites that run JavaScript or JQuery, and I wish to see the content of what these websites sending to the server, and the content of the responses.</p>
  <p>Seeing static files data is easy.  But I don't know how to find the content of exchanged data due to the JavaScript execution.</p>
  <p><em><strong>Question.</strong></em> How to see data exchanged, back and forth, due to JavaScript execution?</p>