title: Intercepting DOM and JS engine calls
body: <p>I want to intercept DOM object read and write queries fired by JS while getting loaded by the browser. After intercepting these calls, i wish to screen them. I have written the logic for screening but am not able to block the calls.</p>
  
  <p>Is there any way other than modifying source code of the browser to achieve this? If so pls help me.</p>