Alright, I know that 99% of my blog readers are not web developers.  But this new addon for Firebug is too useful to pass on letting the 1% possibly miss this important new piece of software:

Firescope (click to download). You can also get it here.

It basically adds an enormous reference library to Firebug. Not only does it tell you about parameters and syntax, it also gives you browser compatibility information. While reference guides have existed for awhile, I’ve never seen anything integrated with a tool like Firebug (ie, actually useful on a daily basis). Sick!