Digging Into The FireQuery Add-on for jQuery

This video digs into the FireQuery add-on for Firebug. FireQuery adds extra functionality to the HTML tab and allows you to visually see embedded data elements and event handlers that were added via jQuery. Also, the familiar jQuerify Bookmarklet has been built into Firebug allowing you to inject jQuery into pages that didn’t have it installed previously. This enables you to play around with jQuery or extract information for a webpage that might not previously have jQuery installed.

Source of the video