Examine source code of New Year Countdown

{
  "manifest_version": 3,
  "name": "New Year Countdown",
  "version": "1.0.1",
  "description": "Replace your new tab page with a beautiful countdown timer to the next year",
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "author": "Nishant Sharma",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "new-year-countdown@my-extensions.org",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "description": "This add-on does not collect any user data.",
        "required": [
          "none"
        ],
        "urls": []
      }
    }
  }
}