Examine source code of Platform Detector

{
  "manifest_version": 2,
  "name": "Platform Detector",
  "version": "1.4",
  "description": "Detecta a plataforma / CMS de um site (WordPress, WooCommerce, Webflow, Shopify, etc.) e mostra detalhes de WordPress.",
  "icons": {
    "48": "icon-48.png"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "<all_urls>",
    "storage"
  ],
  "browser_action": {
    "default_title": "Platform Detector",
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content-script.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "dev@lazyideas.pt",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}