Examine source code of uTube adSkipper

{
  "manifest_version": 3,
  "version": "1.1.0",
  "name": "uTube adSkipper",
  "permissions": [
    "activeTab"
  ],
  "author": "ammhaa2012@gmail.com",
  "description": "This is an ad skipper NOT and ad blocker.\nIt can't be detected by youtube",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5f7ef1c9-2708-4cfc-9de3-5f73ddd9d059}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon-16.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  }
}