Examine source code of ABC Clean

{
  "manifest_version": 2,
  "name": "ABCClean",
  "version": "1.0.1",
  "description": "Elimina la publicidad de abc.es",
  "icons": {
    "48": "icons/logo-30-48.png",
    "96": "icons/logo-30-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.abc.es/*"
      ],
      "js": [
        "abcclean.js"
      ]
    }
  ]
}