Examine source code of Untis Extensions

{
  "manifest_version": 3,
  "name": "Untis Extensions",
  "description": "Untis Extension that enhances WebUntis timetable functionality",
  "version": "1.0.0",
  "homepage_url": "https://github.com/EnnioMrk/untis-extension",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.webuntis.com/timetable*"
      ],
      "js": [
        "injected.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "host_permissions": [
    "*://*.webuntis.com/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "untis-extension@enniomarke.dev",
      "strict_min_version": "109.0"
    }
  }
}