I've recently been noticing a new "feature" on Firefox(which has been my preferred browser for 10+ years now). Basically, if I'm scrolling down a page I typically use two fingers on the trackpad to scroll. I've noticed recently-on a "new" laptop(mid-2012 classic 15" running Mavericks and the most recent version of Firefox) that moving two finger from side to side on the pad will cause the page to advance forward and back. This has become a constant source of annoyance for me, as if I don't drag my fingers up/down in a perfectly straight line, I'll find myself changing pages. I've been through Firefox preferences and can't seem to find a way to turn the feature off. Does anyone know if there's a way to disable this? I'll also add that it happens both with the built in trackpad and an external Magic Trackpad.