Problems using trackpad on iBook with Firefox 0.9

Hi,
I've been using the SideTrack 0.8 trackpad driver to allow vertical
and horizontal scrolling using the edges of the trackpad like most PC
laptops seem to support. I also installed Firefox 0.9, but now whereas
in 0.8 the top of the mousepad allowed me to scroll the page left and
right it seems to scroll the history. I've tried searching for a way
to revert to the previous behaviour through preferences and
about:config but it's not obvious: does anyone know?

-- 
Cheers,
Michael