Examine source code of Grifo-Check

{
  "applications": {
    "gecko": {
      "id": "grifo-check@pabloso.com"
    }
  },
  "manifest_version": 2,
  "name": "Grifo-Check",
  "version": "1.71",
  "minimum_chrome_version": "20.0",
  "description": "Calcula o saldo das batidas de ponto do sistema Grifo, no âmbito da intranet do MPF - Ministério Público Federal.",
  "icons": {
    "48": "icons/icone.svg"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "jquery-3.2.1.min.js",
        "jquery-ui.js",
        "grifo-check.js"
      ]
    }
  ]
}