Examine source code of Currency Converter Mini

{
  "manifest_version": 3,
  "name": "Currency Converter Mini",
  "version": "1.0",
  "description": "Select text and automatically convert it to a target currency",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "currencies.js",
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "currencies.js",
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9957f8fd-1c24-4dee-bae8-39dab844078f}",
      "data_collection_permissions": {
        "required": [
          "websiteContent",
          "websiteActivity"
        ]
      }
    }
  },
  "action": {
    "default_title": "Currency Converter Mini",
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}