Applications :: Scroll In Firefox 3.0/page Jumps Two Or Three Sections

That is, if I'm reading an article, and I put the cursor at the bottom of the scroll bar, and click once, Firefox will scroll two or three sections sometimes. This is very annoying, and didn't happen in Firefox 2.0. To clarify, I'm reading, and I click once, and want the page to jump down one section, and instead it jumps two or three. I've experimented with autoscrolling on/off, and this doesn't help the problem. Should I switch back to Firefox 2.0? One solution is to position the cursor barely below where I want to go, so Firefox can't jump ahead, but I find this annoying and would just as soon switch back to 2.0.