Developer's DescriptionBy DynaTrace SoftwareUnderstand your site's performance, identify hotspots, and fix problems fast.It's like Firebug on steroids. AJAX Edition is a free tool to debug and investigate performance improvements on your site. Download the most advanced browser diagnostics tool for an unprecedented level of visibility and diagnostics into the front-end performance of your website and Asynchronous JavaScript and XML (AJAX) web applications.