SitePoint has released the “first phase” of their JavaScript reference, and they’ve also completely redesigned their Reference Site for improved usability. To coincide with the redesign, they’ve released a handy Firefox add-on called FireScope to integrate their HTML and CSS reference (sadly not their new JavaScript reference) into Firebug and your Firefox browser:

FireScope logo

http://tools.sitepoint.com/firescope

Here’s a screenshot of the new Reference panel in Firebug:

FireScope reference panel in Firebug in Firefox

Read the list of features on the SitePoint website to learn more about the tool:

http://tools.sitepoint.com/firescope/