StumbleUpon Bookmarking Nirvana
Another fantastic Firefox extension. Warning - this is addictive and you will never work again. Hahaha!
StumbleUpon lets you “channelsurf” the best-reviewed sites on the web. It is a collaborative surfing tool for browsing, reviewing and sharing great sites with like-minded people. This helps you find interesting webpages you wouldn’t think to search for.