Examine source code of YouTube Shorts Timeout

{
  "manifest_version": 2,
  "name": "YouTube Shorts Timeout",
  "version": "1.0",
  "description": "Monitors YouTube Shorts pages and closes them after 5 minutes with a warning and a sound.",
  "permissions": [
    "tabs",
    "*://www.youtube.com/*",
    "notifications"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d0b7dc7f-bab3-4b03-9a2f-9956da2ed199}"
    }
  }
}