Examine source code of URL in Title

{
  "name": "__MSG_extensionName__",
  "author": "Terry",
  "version": "0.1.1",
  "description": "__MSG_extensionDescription__",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "24": "icon_24.png",
    "38": "icon_38.png",
    "48": "icon_48.png",
    "96": "icon_96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}