Examine source code of Lucky Prince

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Lucky Prince",
  "version": "1.3.3",
  "manifest_version": 2,
  "icons": {
    "16": "img/HNB16.png",
    "48": "img/HNB48.png",
    "128": "img/HNB128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*.legends-game.ru/game*",
        "https://*.legends-game.ru/game*",
        "http://*.legends-game.ru/vk*",
        "https://*.legends-game.ru/vk*"
      ],
      "js": [
        "main.js"
      ],
      "all_frames": true,
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "main.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4b15437d-69b4-448d-9b46-f5c4e0ac876c}"
    }
  }
}