Examine source code of Udemy UI Switch

{
  "manifest_version": 3,
  "name": "Udemy UI Switch",
  "version": "1.0.2",
  "description": "Instantly toggle between Udemy’s frustrating redesigned interface and the classic layout you loved. If the new redesign disrupts your learning flow, this gives you back control.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "notifications"
  ],
  "host_permissions": [
    "*://*.udemy.com/*"
  ],
  "action": {
    "default_title": "Toggle Udemy UI Switch",
    "default_icon": {
      "16": "icons/old.svg",
      "32": "icons/old.svg",
      "48": "icons/old.svg",
      "128": "icons/old.svg"
    }
  },
  "icons": {
    "16": "icons/new.svg",
    "48": "icons/new.svg",
    "128": "icons/new.svg"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "ui@udemy",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}