Examine source code of Advanced Clock & Timer

{
  "manifest_version": 3,
  "name": "Advanced Clock & Timer",
  "version": "2.0",
  "description": "A comprehensive clock extension with themes, alarms, timers, and world clock",
  "permissions": [
    "storage",
    "alarms",
    "notifications",
    "activeTab"
  ],
  "action": {
    "default_title": "Advanced Clock & Timer"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon-32.png",
    "32": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "anna.digital-time-clock@example.com"
    }
  }
}