Examine source code of FOE Guild Battle Tracker

{
  "manifest_version": 2,
  "name": "FOE Guild Battle Tracker",
  "version": "1.0",
  "description": "Rastrea batallas de gremio en Forge of Empires",
  "permissions": [
    "storage",
    "*://*.forgeofempires.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.forgeofempires.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "foe@example.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}