Firefox only: If you’re a web developer, there’s one Firefox extension that you should without question be using, and that’s Firebug. The extensive web development toolbox just updated to version 1.5, bringing with it several great new features and fixes.
I briefly mentioned the new Firebug in yesterday’s remainders, but it’s such a great tool that it deserves a separate mention. (I don’t know how I could ever have built MixTape.me or put together any of my other web development fiddlings without it.)
Firebug is a free download, works wherever Firefox does. If you’ve used Firebug to build something great, or just to make your day-to-day work that much easier, let’s hear about it in the comments.