Examine source code of AVG

{
  "manifest_version": 2,
  "name": "AVG",
  "version": "1.2",
  "description": "Calcule ta moyenne générale sur MonBureauNumerique.",
  "icons": {
    "48": "icons/avg.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.monbureaunumerique.fr/*"
      ],
      "js": [
        "avg.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{60a141cf-72c9-4799-b587-23279cd4467e}"
    }
  }
}