Examine source code of Studentweb+

{
  "manifest_version": 2,
  "name": "Studentweb Plus",
  "version": "1.1.2",
  "description": "An extension that adds some extra features to Studentweb.",
  "icons": {
    "48": "icons/icon.png"
  },
  "permissions": [
    "activeTab",
    "storage",
    "https://fsweb.no/studentweb/resultater.jsf"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://fsweb.no/studentweb/resultater.jsf"
      ],
      "js": [
        "studentwebplus.js"
      ],
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{74c094bd-fe66-40e0-8b2c-ea4dddafabcb}"
    }
  }
}