Examine source code of NovedADBlock

{
  "name": "NovedADBlock",
  "version": "0.0.2resigned1",
  "description": "Bloquea novedades no deseadas de u-cursos",
  "content_scripts": [
    {
      "matches": [
        "https://www.u-cursos.cl/*"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "block.js"
      ]
    }
  ],
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{8ec634a0-a6e3-408a-99c3-84593f482571}"
    }
  }
}