Examine source code of Alarm Clock

{
  "manifest_version": 3,
  "name": "Alarm Clock",
  "version": "1.0.0",
  "description": "A digital clock that rings at a set time or after a countdown.",
  "permissions": [
    "alarms",
    "storage",
    "notifications"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Alarm Clock",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "alarm-clock@michael-becker-berlin.de",
      "strict_min_version": "115.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}