title: chrome extension get original http response content
body: <p>I'm a newbie of chrome extension and coding a chrome extension.<br>
  Jsonview extension is good extension that prettify json response.<br>
  But when the json response content include html tag(,). it won't pretty it.<br>
  That I want to investigate this situation.<br>
  I fount that jsonview pretty the json response from 'document.body.innerText'.<br>
  The response should be valid json string. but 'document.body.innerText' is destroy by chrome and not valid json string.<br>
  That's the reason jsonview can't prettify.<br>
  So I want to get the original http response content(the valid json string).<br>
  Any one know how to get the original http content?</p>