Examine source code of UACH SEGA Average

{
  "manifest_version": 2,
  "name": "UACH SEGA Average",
  "version": "2.1.1resigned1",
  "description": "Calcula el promedio de un estudiante en UACH SEGA Kardex",
  "homepage_url": "https://github.com/jonaspm/uach-sega-average",
  "author": "Jonás Perusquía Morales",
  "icons": {
    "32": "icons/icon-32.png",
    "128": "icons/icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.sega.uach.mx/sega/kardex/*"
      ],
      "js": [
        "average.js",
        "app.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa0712bf-d7e7-45a0-8f3f-eaf66e56feaa}"
    }
  }
}