Examine source code of Curren Converter

{
  "manifest_version": 2,
  "name": "Currency Converter",
  "version": "1.0",
  "description": "Convert LAK, THB, IDR, MYR to VND and vice versa with the most current standard exchange rate.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{54543f51-1248-4390-9879-6a20fa28a1d7}"
    }
  }
}