Sitepoint.com has introduced a very handy plugin for Firefox called Codeburner. I don't believe it is the first version ever, but I only discovered it today so it is new to me.
CodeBurner is a suite of tools for web developers, that provides reference material for HTML and CSS, integrated with a range of popular development environments.
I been using all day while working on the new CT menu. Its hard to remember everything and little tools like this can make your job a lot easier.
Download CodeBurner from SitePoint
