Examine source code of LearnAwesome

{
  "name" : "LearnAwesome",
  "version" : "0.2.3",
  "description" : "Discover the learning resources from the web, and improve your learning by practicing flashcards.",
  "manifest_version" : 2 ,
  "background" : {
    "scripts" : [
      "browser-polyfill.js" ,
      "background.js" 
    ]
  },
  "browser_action" : {
    "default_popup" : "popup.html",
    "default_title" : "Add or search this page on LearnAwesome.org",
    "default_icon" : {
      "16" : "images/get_started16.png",
      "32" : "images/get_started32.png",
      "48" : "images/get_started48.png",
      "128" : "images/get_started128.png"
    }
  },
  "icons" : {
    "16" : "images/get_started16.png",
    "32" : "images/get_started32.png",
    "48" : "images/get_started48.png",
    "128" : "images/get_started128.png"
  },
  "permissions" : [
    "activeTab" ,
    "contextMenus" 
  ]
}