Mibbit was a web-based client for web browsers[2] that supports Internet Relay Chat (IRC),[3] Yahoo!

[5][6] It is developed by Jimmy Moore[7] and is designed around the Ajax model[8] with a user interface written in JavaScript.

[2] Mobile devices such as the Apple iPhone[11] iPod Touch,[12] and Nokia N800, and other platforms such as the Nintendo Wii are also supported.

[2] Unlike typical web-based IRC clients, Mibbit makes use of a client–server design model.

[14] Mibbit supports the webirc (cgiirc) protocol[15] which allows the client to send the user's IP address and hostname to the IRC server.

Drupal administrators use it to add IRC widgets to sites, noting the benefits of its modular design.

Mibbit now supports DNSBL checking via the DroneBL service as a means to help block access from abusive users and botnets.

[26] On June 19, 2009 it was banned permanently from freenode, and a new officially supported open-source AJAX client was introduced.