Examine source code of Fotogramas Clean

{
  "manifest_version": 3,
  "name": "Fotogramas Clean",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "{334d8bd6-2550-4008-a381-50256c73c8b7}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "description": "Permite leer todos los artículos sin subscripción",
  "icons": {
    "48": "icons/icono-48.png",
    "96": "icons/icono-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://fotogramas.es/*",
        "*://*.fotogramas.es/*"
      ],
      "js": [
        "fotogramasclean.js"
      ],
      "run_at": "document_start"
    }
  ]
}