Examine source code of Wayback machine website and Who is domain

{
  "minimum_chrome_version" : "38",
  "name" : "Wayback machine website",
  "short_name" : "Wayback machine website and Who is domain",
  "icons" : {
    "16" : "assets/icon_16.png",
    "128" : "assets/icon_128.png"
  },
  "applications": {
    "gecko": {
      "id": "@waybackmachinewebarchive",
      "strict_min_version": "48.0"
    }
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "homepage_url" : "http://ulmdesign.mediamaster.eu/ulmdesign/contatti",
  "version" : "1.2.2resigned1",
  "manifest_version" : 2 ,
  "permissions" : [
    "tabs" ,
    "activeTab" ,
    "<all_urls>" ,
    "contextMenus" 
  ],
  "description" : "Online service that have 452 billion web pages saved over time and who is domain tool in context menu"
}