title: Replace text in website with Chrome content script extension
body: <p>I would like to create Google Chrome extension. Its job is to replace a word with another on all websites.</p>
  
  <p>I have the following manifest.json file:</p>
  
  <pre><code>{
    "name": "My extension",
    "version": "1.0",
    "background_page": "background.html",
    "permissions": [
      "tabs", "http://*/*"
    ],
    "content_scripts": [
      {
        "matches": ["http://*/*"],
        "js": ["myscript.js"],
        "run_at": "document_end"
      }
    ]
  }
  </code></pre>
  
  <p>and the javascript in myscript.js is:</p>
  
  <pre><code>&lt; script type="text/javascript" &gt;
      document.body.innerHTML = document.body.innerHTML.replace("uno", "dos");
  &lt; /script &gt;
  </code></pre>
  
  <p>However this does not function.. and I cannot find a way to debug the content script, only the background.html</p>