Examine source code of Currency Buddy

{
  "manifest_version": 2,
  "name": "Currency Buddy",
  "version": "1.0",
  "description": "Quickly convert currencies with additional useful features like historical rates, favorites, and a simple calculator.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f42001d0-bfc4-4489-8ed6-a1c108e0771d}"
    }
  }
}