Much Needed one! Rated 4 out of 5 stars

Great! It's a much needed one for Youtube users.

For GreaseMonkey users, there is a script called http://userscripts.org/scripts/show/122876 which does the same. Although graphically it's not as neat as Janus.

This review is for a previous version of the add-on (1.2.6.1-signed).