Examine source code of Persian Date Converter

{
  "manifest_version": 2,
  "name": "Persian Date Converter",
  "version": "1.0.0",
  "description": "Convert between Jalali (Persian) and Gregorian dates.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "64": "icons/icon64.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "64": "icons/icon64.png",
    "128": "icons/icon128.png"
  },
  "permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "{81d9e130-2e5c-454a-bc03-01899e328919}"
    }
  }
}