Examine source code of Wayback Time Machine

{
  "manifest_version" : 2 ,
  "name" : "Wayback Machine",
  "version" : "6.3.0",
  "description" : "View archived copies of any page, save the current site now, and reopen older snapshots when a link is dead. Internet Archive lookup",
  "icons" : {
    "16" : "images/app-icon/mini-icon16.png",
    "24" : "images/app-icon/mini-icon24.png",
    "32" : "images/app-icon/mini-icon32.png",
    "48" : "images/app-icon/mini-icon48.png",
    "64" : "images/app-icon/app-icon64.png",
    "96" : "images/app-icon/app-icon96.png",
    "128" : "images/app-icon/app-icon128.png",
    "256" : "images/app-icon/app-icon256.png",
    "512" : "images/app-icon/app-icon512.png",
    "1024" : "images/app-icon/app-icon1024.png"
  },
  "browser_action" : {
    "default_icon" : {
      "16" : "images/toolbar/toolbar-icon-archive16.png",
      "24" : "images/toolbar/toolbar-icon-archive24.png",
      "32" : "images/toolbar/toolbar-icon-archive32.png",
      "64" : "images/toolbar/toolbar-icon-archive64.png"
    }
  },
  "permissions" : [
    "activeTab" ,
    "cookies" ,
    "contextMenus" ,
    "notifications" ,
    "storage" ,
    "webRequest" ,
    "webRequestBlocking" ,
    "https://archive.org/*" ,
    "https://*.archive.org/*" ,
    "https://hypothes.is/*" ,
    "<all_urls>" 
  ],
  "optional_permissions" : [
    "bookmarks" 
  ],
  "background" : {
    "scripts" : [
      "scripts/utils.js" ,
      "scripts/background.js" 
    ],
    "persistent" : true 
  },
  "content_scripts" : [
    {
      "matches" : [
        "http://*.wikipedia.org/*" ,
        "https://*.wikipedia.org/*" 
      ],
      "js" : [
        "scripts/wikipedia.js" 
      ],
      "css" : [
        "css/wikipedia.css" 
      ]
    }
  ],
  "web_accessible_resources" : [
    "css/archive.css",
    "images/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b8691db2-0119-46b0-bd7d-a078ad277520}"
    }
  }
}