Runaway scroll bar in firefox 3.5.5 running on openSuSE 11.2

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http://forums.opensuse.org – When I single click on the scroll bar arrows to move one line at a time, Firefox scrolls takes control and scrolls way down (usually to the bottom of the article) before it stops. Most irritating. I tried solving this problem on the Mozilla website but that proved to be useless. any ideas? BTW the problem just occurred on this site. (Distributions)