Firebug from Firefox has been considered as the definitive tool for web developers and web building experts. We are offered with tons and tons of web development tools, especially CSS modification within the browser without changing the code in real-time. You can start exploring the tool right now!
Tough it’s in beta, it offers excellent features and time-savers for debugging code. Next it provides a great ability to tweak CSS. Firebug most likely allows the web developer to spot problems and get them fixed in a live environment, right from the browser window. The features of Firebug do so much to support; it’s definitely an essential for every web developer.
Finally few kilobytes do saves more time of a web developer.
Firebug – not a bug, obviously!