Examine source code of gozo Main Focus

{
  "manifest_version": 2,
  "name": "gozo Main Focus",
  "author": "Maitra Khatri",
  "version": "1.0.2",
  "description": "Replace new tab screen with your today's Main Focus, Weather and Time.",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{39091766-da66-4c2c-82f0-8a79704e8269}"
    }
  }
}