I've been reading articles on Information Addiction. And I think I have the "symptoms". This little add on gives me a great awareness of how much of my day is spent browsing the web. I was astonished to find out that I have had days where I spend 3,4,5 hours browsing. With awareness comes choice and it's great for me to decide "I've been online for 2 hours now." I can go do something else.
One suggestion I'd like to give is to have TimeTracker give a little report that break downs which domain names I've been on by time. For example, I could see how much time is spent on youtube.com, mail.google.com, www.google.com, facebook.com, my company's webmail site, etc. That way I have an idea of how time I'm spending doing something fruitful like emailing my uncle or replying to a co-worker, or am I spending most of my time trying to entertain myself?