Another cool extension

[james....@tafensw.edu.au]

This firefox extension creates a sidebar with all of the (X)HMTL and
CSS elements, attributes, properties etc. There is an offline version
that downloads to your pc all of the help files from the W#.

http://devboi.mozdev.org/

There are also extensions for php and ruby on rails.

I really love this one

Cheers
james