Examine source code of PortalMPF

{
  "manifest_version": 2,
  "name": "PortalMPF",
  "version": "0.3",
  "description": "Altera as propriedades do Portal MPF",
  "icons": {
    "48": "icons/icone.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wrbraga@mpf.mp.br"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://portal.mpf.mp.br/"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "options_ui": {
    "page": "config.html"
  },
  "permissions": [
    "storage"
  ]
}