Examine source code of Crypto Converter

{
  "manifest_version": 2,
  "name": "Crypto Converter",
  "version": "1.0.0",
  "description": "A simple cryptocurrency converter extension",
  "permissions": [
    "tabs",
    "https://cryptoextensionapi.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Crypto Converter",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "128": "icons/icon-128.png"
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23f2c25c-c1e2-4924-a80f-ae4e2c1f7858}"
    }
  }
}