XUL::App is a nifty Firefox extension development framework based on Perl. It has a lot of parallels with Jifty. Recently I gave a talk to our Yahoo! 4e department for XUL::App and it went very well. Here’s the slides that I used in the talk: http://agentzh.org/misc/slides/xulapp/xulapp.xul (a JS-enabled Firefox 2 is required to view these slides) If you’re having problems in displaying the slide