JSON Formatter is a Firefox extension designed to enhance the viewing experience of JSON data. It offers features such as syntax highlighting, over 60 customizable themes, and multiple viewing modes including Parsed, Formatted Raw, and Raw modes. The extension also ensures that links within the JSON data are clickable, which enhances usability for developers and data analysts. With offline functionality and no tracking or analytics, users can work securely and efficiently.

To use JSON Formatter effectively, users need to disable Firefox's default JSON viewer by adjusting settings in 'about:config'. This extension remembers user theme preferences and offers shortcut keys for quick navigation between modes. Additional configuration options allow users to enable functionality for local files and Incognito mode. Overall, JSON Formatter is a powerful tool for anyone working with JSON data in Firefox.