vertical scroll bar

[Ken]

Since either SeaMonkey version 2.9 or 2.9.1 I noticed that the vertical 
scroll bar buttons move the page up or down about three lines rather 
than a single line.  Is there a setting I can make that will allow the 
page to move only one line when the buttons are clicked upon with the 
mouse?  I am NOT talking about the scroll wheel on the mouse, but the up 
and down buttons at each end of the vertical scroll bar.  Thanks.
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