How can I scroll more quickly on mac?

Scrolling is very slow (like half of a line by the wheel movement) on my firefox on Mac OS X Lion mountain, when I just scroll slowly. The scroll crossing accelerated when I scroll quickly is hard enough (so smooth scrolling is enabled). So do turn slowly the wheel is to slow and a bit faster scrolling is too fast, too early for my tase, so scrolling on a page is quite heavy for me. This effect is little matter "smooth scrolling", so it has nothing to do with a bad performance.
How am I able to change this behavior?
I tried the mousewheel.withnokey.numlines parameters (integer, a number any) and mousewheel.withnokey.sysnumlines (bool, false). They have no effect on the scroll at all.
I tried to change my preferences system for scrolling. No effect either.
I tried those with Firefox 17 18 (Beta) and 19 (Aurora) (liberation) after deleting my profile, so without any addons.
Is there something that I missed, or it's just broken?

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Tags: Firefox

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