ChatZilla is an IRC client for Mozilla-based browsers such as Firefox. Developed by Gijs Kruitbosch, Robert Ginda, Samuel Sieb, James Ross
License: Open Source
Chatzilla is a lightweight IRC client that operates as a Firefox extension, making it easy for beginners but limited in functionality and browser compatibility. KVIrc, on the other hand, is a standalone IRC client that offers advanced features and customization options, making it suitable for more experienced users.