Firebug is a Firefox add-on for debugging JavaScript and analyzing HTML, CSS, and the DOM.

• Minified JS files can result in incorrect function names in the Firebug error console and profiler. Presumably other compression schemes also cause problems, but JSMin is known for being reliable and yet still produces erroneous tracebacks.

• You can use a limited version of Firebug's console in IE and other browsers with Firebug Lite. It's a pure JavaScript implementation of Firebug's console.