title: document.body in content.js returns html from popup.html not the webpage
body: <p>I'm working on a profanity filter for chrome and when I use <code>document.body</code> to get the html from the page to apply the filter or when I use something like </p>
  
  <pre><code>var webUrl = chrome.tabs.query({active: true, currentWindow: true},)
  </code></pre>
  
  <p>I just get an undefined variable.</p>
  
  <p>I was wondering for any pointers where I'm going wrong, or any other method to be able to search through the text on a web page and apply a RegExp to filter for me.</p>
  
  <p>Cheers for any help!</p>