Examine source code of Widgetopia

{
  "manifest_version" : 3 ,
  "name" : "Widgetopia",
  "version" : "2.0.0",
  "description" : "Customize your new tab page with widgets",
  "icons" : {
    "16" : "icons/icon16.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "chrome_url_overrides" : {
    "newtab" : "index.html"
  },
  "action" : {
    "default_icon" : {
      "16" : "icons/icon16.png",
      "48" : "icons/icon48.png"
    },
    "default_title" : "Widgetopia"
  },
  "permissions" : [
    "storage" ,
    "history" ,
    "bookmarks" ,
    "identity" 
  ],
  "host_permissions" : [
    "https://www.googleapis.com/*" ,
    "https://accounts.google.com/*" ,
    "https://oauth2.googleapis.com/*" 
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "widgetopia@example.com",
      "strict_min_version": "109.0"
    }
  }
}