Examine source code of Alarm Clock

{
  "manifest_version": 3,
  "name": "Alarm Clock",
  "version": "1.0.0",
  "description": "Set an alarm at a specific time with a desktop notification.",
  "browser_specific_settings": {
    "gecko": {
      "id": "alarmclk100@toolbox.example",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "alarms",
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "Alarm Clock"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  }
}