Rated 4 out of 5 stars

NoiaScrollbars 1.0.3pre4

Adds a gradient to the top of the scroll bar when using transparency feature

http://i39.tinypic.com/3520i8l.jpg

This review is for a previous version of the add-on (1.0.2). 

This extension doesn't add the gradient, it is a "Windows" feature. Look exactly at your window (any window) caption and you will see there is always such a gradient, not only with glass effects on. ;-) You cannot disable it.

http://imageshack.us/photo/my-images/824/21377427.png/