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
Irssi is a lightweight, command-line based IRC client favored by advanced users for its customization and performance. In contrast, Chatzilla is a user-friendly IRC client integrated into Firefox, making it accessible to casual users but less customizable than dedicated clients like Irssi.