Facebook Chat Enters My Network

After weeks of anticipations (well maybe curiousity) the Facebook chat function has appeared on my page. Sitting in the lower right corner of the window it shows a nice popup with a list of my friends who are online right now - click on the name/image of the friend and the chat window pops up. Nice, but of course it only works while I am within the Facebook site, which last summer would have meant several hours a day - but now really just adds up to a quick glance when I get an alert through my Firefox Facebook toolbar.