Examine source code of Number System Calculator

{
  "manifest_version": 2,
  "name": "Number System Calculator",
  "version": "1.0",
  "description": "A Number System Converter is one that can be used to convert a number from one type to another type namely Decimals, Binary, Octal, and Hexadecimal. It will have the option to select the number type for input as well as the resulting output. The default input will be 1 that on change will show simultaneous results.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/conve-logo.png"
    }
  },
  "icons": {
    "128": "images/conve-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f1e007b0-e181-41a3-913a-7e631d6cb208}"
    }
  }
}