Examine source code of Base Encoder

{
  "manifest_version": 2,
  "name": "Base Encoder",
  "version": "1.2.1",
  "description": "多功能編碼/解碼工具，支援 Base64/Base58 編碼解碼、進制轉換 (2-36)、Unicode 編碼解碼，並具備數據持久化功能。",
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_popup": "src/popup/popup.html",
    "default_title": "Base Encoder",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "base-encoder-tool-2025@vicky.dev",
      "strict_min_version": "109.0"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}