title: Google Chrome extensions document.title not working
body: <p>here is the code in the manifest.json</p>
  
  <pre><code>{
    "name": "Page Title changer",
    "version": "1.0",
    "description": "Change the &lt;title&gt;&lt;/title&gt; of a page",
    "browser_action": {
      "default_icon": "icon.png"
    },
    "content_scripts": [
      {
        "matches": ["http://*/*"],
        "js": ["changetitle.js"]
      }
    ]
  }
  </code></pre>
  
  <p>and here is the code from the changetitle.js file<br /></p>
  
  <pre><code>chrome.browserAction.onClicked.addListener(function() {
      document.title = 'new page title';
  });
  </code></pre>
  
  <p>i don't understand why it isn't working, i checked the google code docs while writing this extension.</p>