Examine source code of masmenosuno

{
  "applications": {
    "gecko": {
      "id": "masmenosuno@adderou.cl",
      "strict_min_version": "57.0"
    }
  },
  "manifest_version": 2,
  "name": "masmenosuno",
  "version": "1.1resigned1",
  "description": "Entrega una estadística de comentarios \"+1\" o \"-1\" de las publicaciones de U-Cursos.",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "https://www.u-cursos.cl/*",
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.u-cursos.cl/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ]
}