Examine source code of Base Converter

{
  "manifest_version" : 3 ,
  "name" : "Base Converter",
  "version" : "1.0",
  "description" : "Convert numbers between binary, octal, decimal and hexadecimal.",
  "action" : {
    "default_popup" : "popup.html",
    "default_icon" : "icon.png",
    "default_title" : "Base Converter"
  },
  "icons" : {
    "128" : "icon.png"
  },
  "permissions" : [],
  "browser_specific_settings": {
    "gecko": {
      "id": "nesslennox016@hotmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}