Scrolling "Area" is too small.
I used to be able to grab the scroll bar with my mouse, click and drag up in any direction....even across the browser and it would keep scrolling. Now if I get more than about 75 or 100 pixels to the left it stops scrolling and snaps back to the previous position. One I click I should be able to drag in any direction and it should scroll at a speed relative to the angle I'm dragging away. A more vertical angle should be faster and a more horizontal should be slower.
Soluzione scelta
After playing some more I realized that this is not a firefox problem but a microsoft problem.
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Do you have the setting called 'widget.non-native-theme.scrollbar.size' when you navigate to about:config? Increase this to maybe 100 and hit enter. Then, refresh the page. It works for me.
Sounds that you are talking about auto-scrolling that you initiate by clicking the mouse wheel in free space (i.e. not an active area or link) on the webpage. You can find this setting in "Settings -> General -> Browsing -> Use autoscrolling".
Soluzione scelta
After playing some more I realized that this is not a firefox problem but a microsoft problem.