The bug, and a partial fix is described here:
http://gtk-qt.ecs.soton.ac.uk/trac/ticket/2
Based on that, here's a fix for *both* Firefox scrollbars -- simply add the following code to the userContent.css file under your home directory (this should be located in something like the ~/.mozilla/firefox/.../chrome/ directory):
Code: Select all
scrollbar slider
{
margin-left: -1px;
border-left: 1px solid #8C8D90;
margin-top: -1px;
border-top: 1px solid #8C8D90;
}