Examine source code of Currency Converter Basic

{
  "manifest_version": 2,
  "name": "Currency Converter",
  "version": "1.0",
  "description": "In extension, we will implement a currency converter that simply converts the currency into any other country’s currency.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/curent-logo.png"
    }
  },
  "icons": {
    "128": "images/curent-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a4af7e19-7ee9-4c1a-a944-104be9144a95}"
    }
  }
}