I'm currently thinking of developing a little 'chatbar' app for a local msgboard. I've looked over the XUL tutorial at xulplanet and have gotten so far as to get a working XUL file that'll open up a window to the site's chat application. I'd really like to make this a toolbar that a user can install via an XPI file, but I'm having trouble with that part. I've been searching around for a little while now and can't find any sort of step-by-step tutorial for creating a toolbar for firefox. If someone could help me out with finding a tutorial on this, I'd be much obliged.