App: prettyJSON for Safari
Developer: David A. Shamma
Genres: Developer Tools, Utilities

Pretty format JSON data in Safari with this extension and a simple toggle button.  No data is sent back to a server (it's secure) and no CSS or modifications added to the page until the toggle is turned on. Plus, 100% free and open-source. 

This plugin works with JSON from a server (no local files) and served with the correct MIME type and content-security. 

Visit the support URL for more...thanks!

Release notes:
Adding new application window with some help text and buttons to jump to Safari.

Updated app description and screenshots.