Examine source code of JSON Format Converter

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "0.1.2",
  "description": "__MSG_appDescription__",
  "default_locale": "en",
  "permissions": [
    "tabs"
  ],
  "action": {
    "default_title": "__MSG_appName__"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "json-format-converter@jetsung.com",
      "strict_min_version": "128.0"
    }
  }
}