Rated 4 out of 5 stars

This solved my problem of not being able to open chatzilla in firefox 4:Right click the shortcut to firefox on your desktop and click properties. Add "-chat" to the end of the target. Voila. I got this tip from:

http://www.youtube.com/watch?v=X8kX04E7ji0

This review is for a previous version of the add-on (0.9.86.1.1-signed).