xmpp4moz integrates the XMPP protocol (also known as Jabber) into Mozilla applications.
Remote shell and test-driven development tool for Mozilla developers
Extensible instant messaging client based on the XMPP (Jabber) protocol. ***ATTENTION***: it REQUIRES the xmpp4moz extension. Download it from https://addons.mozilla.org/firefox/3632/, or get an all-in-one package from http://www.sameplace.cc/download