This application integrates with Firefox to put a wealth of web development tools while the users browse. They can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page. The users can open Firebug in a separate window, or as a bar at the bottom of the browser. It also gives fine-grained control over which websites the users want to enable it for.
Current is a Mac app that keeps you connected to Facebook from the menu bar, so you never miss a message.