Examine source code of Boxel Golf

{
  "manifest_version": 3,
  "name": "Boxel Golf",
  "description": "Boxel Golf is a multiplayer golf game packed with challenging courses, custom hats, and a powerful level builder.",
  "version": "1.3.8",
  "action": {
    "default_popup": "index.html",
    "default_title": "Boxel Golf",
    "default_icon": {
      "16": "img/png/icon16.png",
      "48": "img/png/icon48.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0e3c0011-bef8-4932-b8c2-bf1fbe09b2f2}"
    }
  }
}