Examine source code of FaB Stats - GEM Exporter

{
  "manifest_version": 3,
  "name": "FaB Stats - GEM Exporter",
  "version": "2.2.3",
  "description": "Export your Flesh and Blood match history from GEM to FaB Stats. Uses structured parsing for accurate data extraction.",
  "browser_specific_settings": {
    "gecko": {
      "id": "fabstats@fabstats.net",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://gem.fabtcg.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}