Examine source code of UFC Calendar Pro

{
  "manifest_version": 2,
  "name": "UFC Calendar",
  "author": "Castleridge Labs",
  "description": "Conveniently get live updates of UFC events and view previous/upcoming events with one click.",
  "version": "1.1.1",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "UFC Calendar",
    "default_icon": {
      "16": "/icons/icon16.png",
      "48": "/icons/icon48.png",
      "128": "/icons/icon128.png"
    }
  },
  "background": {
    "scripts": [
      "serviceWorker.js"
    ]
  },
  "icons": {
    "16": "/icons/icon16.png",
    "48": "/icons/icon48.png",
    "128": "/icons/icon128.png"
  },
  "options_page": "options/options.html",
  "browser_specific_settings": {
    "gecko": {
      "id": "{5067225d-158f-442c-8fee-14332cba154c}"
    }
  }
}