More Firefox extensions you should download

StumbleUpon boasts a large community of subscribers to its service, the primary goal of which is to help you "stumble upon" Web sites you might otherwise miss, through the reviews and recommendations of other users. The StumbleUpon toolbar extension for Firefox allows you to register, log in, and join these "stumblers" on their quest to find the best of the Internet.

• Part 1,
• Part 2,
• Part 3, and
• Part 4.