Examine source code of xrate-currency-converter

{
  "manifest_version": 2,
  "name": "Xrate Currency Converter",
  "version": "0.1.31",
  "description": "Intelligent web currency converter with real-time detection",
  "permissions": [
    "storage",
    "activeTab",
    "*://api.exchangerate-api.com/*",
    "*://open.er-api.com/*",
    "*://api.frankfurter.app/*",
    "*://api.fixer.io/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "web_accessible_resources": [
    "assets/*",
    "icons/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "xrate-extension@shivaprasadsmiles.dev",
      "strict_min_version": "91.0"
    }
  }
}