Examine source code of Date Time Countdown

{
  "manifest_version": 3,
  "name": "Date Time Countdown",
  "version": "1.0",
  "description": "Displays current date and time, with a 10-day countdown and notification.",
  "permissions": [
    "storage",
    "notifications"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "zekristenordazievc921@hotmail.com"
    }
  }
}