ENYO-3210: Added better support for trackpad scrolling in Firefox.
ENYO-3210: Added better support for trackpad scrolling in Firefox.

Enyo-DCO-1.1-Signed-off-by: Aaron Tam <aaron.tam@lge.com>

enyojs/enyo,enyojs/enyo,PKRoma/enyo,PKRoma/enyo