To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!Close
Welcome to Firefox Add-ons.
Choose from thousands of extra features and styles to make Firefox your own.Close
Rated 4 out of 5 stars
StumbleUpon would not be the same without the add-on. The add-on practically makes the site.This review is for a previous version of the add-on (4.16.1-signed).