Examine source code of Schulnetz REVANCED

{
  "manifest_version": 3,
  "name": "Schulnetz REVANCED",
  "version": "3.0.0.3",
  "description": "Eine Erweiterung zur Verbesserung der Schulnetz-Erfahrung.",
  "permissions": [
    "storage",
    "alarms",
    "notifications"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "schulnetz-revanced@firefox.addon"
    }
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "options_ui": {
    "page": "content/frontend/settings.html",
    "open_in_tab": true
  },
  "action": {
    "default_title": "Schulnetz REVANCED Einstellungen",
    "default_popup": "content/frontend/index.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "host_permissions": [
    "*://schulnetz.lu.ch/*",
    "*://api.github.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://schulnetz.lu.ch/*"
      ],
      "js": [
        "content/i18n/du.js",
        "content/i18n/sie.js",
        "content/modders.js",
        "content/contentScript.js"
      ],
      "css": [
        "content/styles.css"
      ],
      "run_at": "document_start"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "icons/*.png",
        "content/fonts/*"
      ],
      "matches": [
        "*://schulnetz.lu.ch/*"
      ]
    }
  ]
}