Examine source code of Booking Price Breakdown

{
  "manifest_version": 3,
  "name": "Booking Price Breakdown",
  "version": "1.1",
  "description": "Desglosa el precio total de Booking.com en precio por persona, por noche y por noche/persona.",
  "browser_specific_settings": {
    "gecko": {
      "id": "{38c8e3a2-1e4f-4f5d-8a7b-9c0d1e2f3a4b}",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage"
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'none'; script-src 'self'; style-src 'self'; img-src 'self'; connect-src 'none';"
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Booking Price Breakdown",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.booking.com/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_idle"
    }
  ]
}