I've never thought about this, but you're actually correct - normal scrolling really is quite slow. There are two reasons this has never bothered me though: 1.

I've never thought about this, but you're actually correct - normal scrolling really is quite slow. There are two reasons this has never bothered me though: 1. I always install Vimium in order to avoid using the mouse when browsing the web. (So in that regard your statement above is correct :-) ) 2. For fast scrolling with the mouse, you could try enabling autoscroll in Firefox; once enabled middle click will activate it, then the page will scroll based on the direction and distance you move the mouse from the scroll anchor.