Examine source code of Gamble Classroom

{
  "manifest_version": 3,
  "name": "Gamble Classroom",
  "version": "0.8",
  "description": "adds some gambling games to google classroom",
  "content_scripts": [
    {
      "matches": [
        "https://classroom.google.com/*"
      ],
      "js": [
        "cosmetics.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_icon": "icon.png"
  },
  "permissions": [],
  "web_accessible_resources": [
    {
      "resources": [
        "images/*",
        "fonts/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "3d53ad9e6be2f596be932c19c725dd39baec7514@cosmicvontec"
    }
  }
}