Examine source code of Semana f0f

{
  "description": "Protege tu privacidad evitando tener que registrarse en semana.com para ver sus artículos.",
  "manifest_version": 2,
  "name": "Semana f0f",
  "version": "1.1resigned1",
  "homepage_url": "http://f0f.com",
  "icons": {
    "48": "icons/ic_vpn_key_black_48dp_1x.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.semana.com/*"
      ],
      "js": [
        "semana_f0f.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8c84a679-5cfe-4576-8883-b10486e531e9}"
    }
  }
}