I've *Stumbled Upon* something addictive

I found something that has become a huge time waster for me. Not a good thing with a part-time job and three small kids. If you use Mozilla firefox as your way to surf the web, you can get an extension called Stumble upon. What this allows you to do is put in a list of interests. Like some of mine are: Parenting, crafts, web design. Then I click on Stumble on my tool bar and it brings up sites I might like. If I like it I click like it and it saves it for me. If I don't, it doesn't bring up sites like that anymore. Pretty cool eh? Beware, It has become addictive for me. :)