Examine source code of gvcs

{
  "name": "gvcs",
  "version": "0.1.2",
  "manifest_version": 2,
  "description": "__MSG_appDesc__",
  "default_locale": "ru",
  "content_scripts": [
    {
      "js": [
        "gvcs.js"
      ],
      "matches": [
        "*://godville.net/news",
        "*://godvillegame.com/news"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aca7a591-f3e9-483c-93dc-c1a1cdd109fb}"
    }
  }
}