Firefox 3 is old news, but there's something lurking within that few may be aware of, a new level of language integration that allows other scripting languages to be used in place of JavaScript for UI “chrome” development in Gecko 1.9. The Python implementation is called PyDOM, and is a part of the PyXPCOM bindings by Mark Hammond. In this talk I'll take you through the basics of developing XUL applications using PyXPCOM and PyDOM.