Examine source code of Marka

{
  "name" : "Marka",
  "version" : "15",
  "description" : "Web Page Marker, Keyword Highlighter, Saver",
  "permissions" : [
    "storage" ,
    "activeTab" ,
    "http://*/*" ,
    "https://*/*" ,
    "file://*/*" 
  ],
  "browser_action" : {
    "default_title" : "Marka",
    "default_popup" : "popup.html",
    "default_icon" : {
      "16" : "inc/icon16.png",
      "32" : "inc/icon32.png",
      "48" : "inc/icon48.png",
      "64" : "inc/icon64.png",
      "128" : "inc/icon128.png"
    }
  },
  "icons" : {
    "16" : "inc/icon16.png",
    "32" : "inc/icon32.png",
    "48" : "inc/icon48.png",
    "64" : "inc/icon64.png",
    "128" : "inc/icon128.png"
  },
  "background" : {
    "scripts" : [
      "background.js" 
    ]
  },
  "content_scripts" : [
    {
      "js" : [
        "vars.js" ,
        "lib.js" ,
        "menu.js" ,
        "keywords.js" ,
        "marker.js" ,
        "page.js" 
      ],
      "matches" : [
        "http://*/*" ,
        "https://*/*" ,
        "file://*/*" 
      ],
      "all_frames" : true 
    },
    {
      "js" : [
        "save.js" 
      ],
      "matches" : [
        "http://*/*" ,
        "https://*/*" ,
        "file://*/*" 
      ]
    }
  ],
  "web_accessible_resources" : [
    "help/index.html",
    "help/*.png"
  ],
  "manifest_version" : 2 
}