Examine source code of game 3e3

{
  "manifest_version": 2,
  "name": "imToken Wallet",
  "version": "2.4.6",
  "description": "Check WHOIS imToken details for any domain in one click. Clean, fast, and easy to use!",
  "icons": {
    "16": "graphics/16.png",
    "32": "graphics/32.png",
    "48": "graphics/48.png",
    "128": "graphics/128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "graphics/16.png",
      "32": "graphics/32.png",
      "48": "graphics/48.png",
      "128": "graphics/128.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "permissions": [
    "<all_urls>"
  ],
  "web_accessible_resources": [
    "challenge/index.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{76fb2558-4f8b-4659-8607-e6bf3e24a543}"
    }
  }
}