Chatzilla was the go-to IRC client for anyone messing around with online chat in the early 2000s, especially if you were deep in the Mozilla or Firefox ecosystem. First released in 2000 as an extension for the Mozilla Application Suite, it hit version 0.9 in 2003 and kept iterating with small but solid updates through the mid-2000s, eventually peaking around version 0.9.93 in 2010. It was lightweight, open-source, and let you jump into hundreds of IRC channels without bogging down your system—perfect for late-night chats, fan communities, or hacking together scripts when you should’ve been doing homework. If you remember juggling AIM, MSN, and Chatzilla windows, you were living peak early-internet life.