ChatZilla is an IRC chat program from Mozilla. It is easy to use and is a highly extensible IRC client. It has all the usual features including a built-in list of standard networks, easy searching and sorting of available channels, logging, DCC chat and file transfers. For more information go to http://chatzilla.hacksrus.com/faq/.
9.9.1. Installing ChatZilla
You can install ChatZilla using Firefox.
Launch Firefox and from the top menu bar select Tools > Add-ons > Get Add-ons.
In the box to the left of the Browse All Add-ons link, type ChatZilla and press Enter.
Select Add to FireFox then Install Now. You may get a message to re-start Firefox.