Examine source code of Remove Paper Advice

{
  "manifest_version": 2,
  "name": "Remove Paper Advice",
  "version": "1.0",
  "description": "Elimina el aviso sobre el bloqueador de anuncios en ciertos diarios online ",
  "icons": {
    "48": "icons/removeadvice.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.elmundo.es/*",
        "*://*.marca.com/*",
        "*://*.elpais.com/*",
        "*://*.lavanguardia.com/*"
      ],
      "js": [
        "removeAdvice.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{2678cf8e-2ec7-415d-aedd-a8d3faea92b9}"
    }
  }
}