FireBug

A couple days ago I posted about a FireFox extension that gives you a live JavaScript REPL running inside the currently loaded web page. Since then, I stumbled across Firebug, which IMHO may just be the greatest web development extension for Firefox since … err.. well since the Firefox Web Developer extension!. Firebug allow you to open a panel across the bottom of your Firefox window that gives you a ton of functionality including inspecting the HTML of any highlighted part of your currently loaded web page, inspecting registered Javascript event handlers, etc. It even includes a very impressive JavaScript debugger and profiler. Check out this video for an overview!

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