Examine source code of Capture The Flag

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      "256" : "icons/icon_256px.png",
      "512" : "icons/icon_512px.png"
    },
    "default_popup" : "popup.html"
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": false
  },
  "author": "Yaroslav Ilin",
  "background" : {
    "scripts" : [
      "background.runtime.js" ,
      "background.js" 
    ]
  },
  "minimum_chrome_version" : "36",
  "permissions" : [
    "dns" ,
    "webRequest" ,
    "<all_urls>" ,
    "storage" 
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  "browser_specific_settings": {
    "gecko": {
      "id": "@ctf"
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