Examine source code of Webcampus-flashbox

{
  "description": "Ajoute une croix pour enlever les popup horrible webcampus",
  "manifest_version": 3,
  "name": "Webcampus-flashbox",
  "version": "2.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "salviostrazzante0@gmail.com",
      "strict_min_version": "42.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://webcampus.unamur.be/my/"
      ],
      "js": [
        "antiflashbox.js"
      ]
    }
  ],
  "permissions": [
    "activeTab",
    "contextMenus"
  ]
}