Examine source code of Smiley Ogame

{
  "manifest_version": 2,
  "name": "Smiley Ogame",
  "version": "1.1",
  "description": "Smiley for Ogame Chat",
  "icons": {
    "16": "/images/smiley16.png",
    "32": "/images/smiley32.png",
    "48": "/images/smiley48.png",
    "128": "/images/smiley128.png"
  },
  "content_scripts": [
    {
      "exclude_matches": [
        "https://*.ogame.gameforge.com/game/admin2/*"
      ],
      "matches": [
        "https://*.ogame.gameforge.com/game/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8124b731-0998-4bbe-899a-3a2bb4358ae0}"
    }
  }
}