Examine source code of Simple Currency Converter

{
  "name": "Currency Converter",
  "version": "1.0",
  "description": "A personalized currency converter extension",
  "manifest_version": 2,
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "16.png",
      "48": "48.png",
      "128": "128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2790fa7c-4c0b-44cc-9800-0397cb1fd755}"
    }
  }
}