I mostly use the scrollbar as "buttons," clicking below or above the handler, rather than grabbing the handler itself. So when I've scrolled down quite a bit, I'll often mistakenly click above the handler when I really wanted to scroll down. That's kind of possibly solved if those barely useful up and down buttons were large enough to be more useful than pressing page up, down, or arrow keys instead. So this usercss does that:
Code:
::-webkit-scrollbar {
width: 12px;
...