1 of the top 10 Rated 5 out of 5 stars

It's 1 of the best adds @ all

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

This is an *excellent* add-on for StumbleUpon users. It keeps all common tasks very conveniently located in a StumbleUpon toolbar that can be displayed or hidden with a hotkey.

I miss this add-on terribly after upgrading to Firefox 4.0b6. While the add-on seems to function, it causes other extensions' toolbar buttons to disappear. I can't wait for official support for Firefox 4.0.

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

The stumbleupon addon helps keep the net interesting for me.

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

When I'm bored I love to randomize my surfing experience with stumbleupon's addon

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

use it all the time

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

I've been a big fan of Stumble for a while!

This review is for a previous version of the add-on (3.73). 

Rated 5 out of 5 stars

A classic in serendipity. Nice when you have a bit of spare time.

This review is for a previous version of the add-on (3.73). 

Rated 4 out of 5 stars

I Love StumbleUpon, But the toolbar Is WHITE.
Please add a option to change the toolbar color.

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

Now that's real serendipity!

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

THE best social network ever

This review is for a previous version of the add-on (3.64). 

Rated 2 out of 5 stars

Eh. It's OK. Mostly it's fun for trolling purposes alone, because the sites that get submitted are total crap. Also, keep in mind that there are almost no "sites" added to SU; instead, individual pages from blogs are submitted. The idea had some potential, but the execution was poor and the userbase even worse.

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

Definitely an awesome addon to have when you love to sit on your computer for hours and randomly surf the web, makes finding sites matching your interests a lot easier and turns up a lot of sites one might not find otherwise! Also awesome that it's still working in 4.0 even though it's not listed as compatible (though you'll need to have the compatibility addon in order to enable it).

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

one of the best addons ever!!!!!!!!!!!!!!!!!!!!! its perfect... i've omly had it for a day, but i've discovered so many cool things!! definitely worth installing

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

I Love Stumble! As a recovering substance abuser, boredom is one of my worst enemies and have turned to Stumble Upon to help me combat it many times. So thank you SU !! For funny,beautiful,inspirational and always interesting surprises that have given me positive and wondrous thoughts. Moss54 6/21/2010

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

The best thing happened to me after WW-II (avoided), birth, God and second marriage!
It works flawlessly and flexible - much better than their add-on for Internet Explorer does.
(Who needs IE anyways)...
I recommend this to all Mozilla-based browser users. I have tested with Seamonkey, Firefox, CometBird, Orca, Flock and i tested even with good old Navigator 9 - all worked well and fine!
What do do with this add-on?
From websites, beautiful pics and art, poetry and anything under max 127 personalized topics and social networking up to marriage (the last was my case, can happen to anyone) ;))

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

Love this toy and have been Stumbling through the internet for about 3 years now. If I have to reinstall for whatever reason, this is the first extension I install. THe best laughs, the most beautiful art, etc.

This review is for a previous version of the add-on (3.64). 

Best Thing Since: Modern Fuel Economic Vehicles, Indoor Plumbing, and Organic Sliced Bread all Rolled into One! Rated 5 out of 5 stars

I have been a big stumbler since 2007, ever since a coworker told me about this terrific Firefox add-on. Stumble Upon works and fits, amazingly well for a bunch of very different needs (firstly, you customize the page with items interesting to you after the initial sign up). For instance, if you have a few hours to kill while waiting for the plans you made to start, try stumbling through the video option (the hours will fly by and before you know it, it’s time to walk out the door). Looking for a particular website or video everyone is talking about? Always try searching SU (stumble upon) first, because if it's popular, chances are SU has already had it added to their HUGE database by one of their 10+ Million stumblers! And even if you are just bored, SU is a great way to see what other people, from all over enjoy watching, and it’s also very fun to come across new media that no one has given thumbs up to yet. Ever since I first stumbled that day after work, I don't think 3 or 4 whole days have gone by where I didn't try to convince a friend or coworker (even random people I meet out) to download and sign up. And to this day I have had nothing but great, positive feedback telling me how much they all enjoy this program. I only wish I were qualified to work for Stumble Upon in their Marketing department, because I know I would/could sell the heck out of this fantastic, internet playground/learning device, because there truly is something for everyone. Thank you everyone at Stumble Upon for doing a wonderful job, on such a wonderful product!
B

p.s. Besides Stumble Upon, the only other significant internet entertainment/education site I use, is a movie rental/watcher one. Even though I pay for the privilege to use it, hands down I stumble more than anything else!

This review is for a previous version of the add-on (3.64). 

Rated 4 out of 5 stars

I love stumbling !
I see some great stuff I'd never of seen before.
I'd like to see some new content and just a stumble button with a drop down menu instead of a big tool bar.

This review is for a previous version of the add-on (3.64). 

Rated 5 out of 5 stars

Well I've been using Stumble add-on for a long while now and have to say I find it quite useful for randomly coming across sites that people would otherwise miss.

Also the person who said that most of the content is from 2002, I guess they haven't used it much for them to say that as there is always new content being added by other members.

This review is for a previous version of the add-on (3.64). 

Rated 2 out of 5 stars

OK this addon I've been using since August of '06 and don't like the direction SU is taking with the addon or the
stumbleupon content itself, most of what you "stumble"
is outdated such as much of the content from 2002.
And the toolbar has changed so much that a lot of the things I liked upon joining are now gone...as well as most of the longtime stumblers... to tumblr or posterous.
It's a shame as this used to be cool.

This review is for a previous version of the add-on (3.64).