By default Firefox bookmark menus behave much like any other normal menus in Windows and you usually navigate to the desired item and click it to load in a tab. This simple mechanism is pretty functional but in some circumstances particularly for the users that have a long list of bookmark items in some folder placed on bookmarks toolbar, they will have to auto scroll through the long list before reaching the desired item in the menu (say if the required item somehow happens to be towards the end ...

Volumouse is a useful utility by Nirsoft that allows to change the volume in Windows by simply scrolling the mouse-wheel rather than to click on the system-tray icon of the volume and changing it from there. However it is a bit of over simplification as the software provides a lot of flexibility by allowing to define rules that govern under which conditions scroll-wheel will be used. If the conditions of a rule that you have defined are not met then scroll-wheel will be used as normal in Windows ...