Examine source code of Cadastre Maps

{
  "manifest_version": 3,
  "name": "Cadastre Maps",
  "version": "1.0",
  "description": "Obtenez les données cadastrales officielles (IGN) depuis Google Maps.",
  "author": "RefCadastrale",
  "developer": {
    "name": "RefCadastrale",
    "url": "https://refcadastrale.fr"
  },
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "*://www.google.com/maps/*",
    "*://www.google.fr/maps/*",
    "https://apicarto.ign.fr/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/maps/*",
        "*://www.google.fr/maps/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cadastre-maps@refcadastrale.fr",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_title": "Cadastre Maps",
    "default_icon": {
      "16": "icon16.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  }
}