Examine source code of Dota2Ru Smiles

{
  "manifest_version": 2,
  "version": "1.0.0.2",
  "name": "D2S - форумный редактор",
  "description": "Кастомные смайлы, новый чат, редактор текста и прочее!",
  "content_scripts": [
    {
      "css": [
        "extens.css"
      ],
      "js": [
        "assets/js/setting.js",
        "assets/js/queryfinder.js",
        "assets/js/footerfunctions.js",
        "assets/js/database.js",
        "extension.js"
      ],
      "matches": [
        "*://dota2.ru/forum*"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "*://dota2.ru/*",
    "*://script.google.com/*",
    "*://script.googleusercontent.com/*"
  ],
  "icons": {
    "16": "assets/images/favicon_16.png",
    "48": "assets/images/favicon_48.png",
    "128": "assets/images/favicon_128.png"
  },
  "web_accessible_resources": [
    "/assets/*"
  ]
}