Comment 1 for bug 14280

I'll claim this one since it's really on xserver-xorg, and since I added that.

The problem is not Firefox behaviour, but user expectations. People simply
don't expect horizontal scrolling to work on touchpads, cool as it is (I had
multi-finger taps, corner taps, circular, horizontal and vertical scrolling
enabled on my touchpad). It is disabled for that reason -- vertical scrolling
is hard enough to grok, but horizontal scrolling being on by default freaks
people out.