I love this add-on! Rated 5 out of 5 stars
StumbleUpon is one of the greatest add-on I have ever used! I've been using StumbleUpon since 2006 and I have recommended it to others time and time again. There are always new and very interesting pages to see and review. You have not seen all that the internet can offer until you've used StumbleUpon!This review is for a previous version of the add-on (4.11.1-signed).