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 3 out of 5 stars
Update works just fine.
Thank you for reacting so quickly!
edit (30-September-2012): I think it’s not working again (FF v. 15.0.1; add-on v. 1.0.3, YT HTML5 is off).