Fixed dragAndDrop2.html for FireFox.
Fixed dragAndDrop2.html for FireFox.

Signed-off-by: Grant Skinner <59bd0a3ff43b32849b319e645d4798d8a5d1e889@gskinner.com>

julianromera/EaselJS,exsodus3249/EaselJS,ytiurin/EaselJS,johnv315/EaselJS,markknol/EaselTS,speedlightconsulting/EaselJS,SpringRoll/EaselJS,xushuwei202/EaselJS,bambalaus/EaselJS,thinkerchan/EaselJS,CreateJS/EaselJS,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,nbellowe/EaselJS,zhengjiangbin/EaselJS,legendvijay/EaselJS,julianromera/EaselJS,gitzxon/EaselJS,andrew168/EaselJS,felipegtx/EaselJS,zhengjiangbin/EaselJS,ovcharik/EaselJS,SpringRoll/EaselJS,kidaa/EaselJS,8823-scholar/EaselJS,mientjan/weasel,Teino1978-Corp/https-github.com-Teino1978-Corp-EaselJS,xushuwei202/EaselJS,rhildred/abacus,mientjan/EaselTS,ytiurin/EaselJS,briesurrood/EaselJS,kidaa/EaselJS,EricHodgins/EaselJS,thinkerchan/EaselJS,felipegtx/EaselJS,speedlightconsulting/EaselJS,gitzxon/EaselJS,ebabel-eu/EaselJS,briesurrood/EaselJS,mientjan/weasel,markknol/EaselTS,8823-scholar/EaselJS,EricHodgins/EaselJS,nbellowe/EaselJS,andrew168/EaselJS,createjs-components/easeljs,rhildred/abacus,bambalaus/EaselJS,ovcharik/EaselJS,exsodus3249/EaselJS,johnv315/EaselJS,abouthiroppy/EaselJS,abouthiroppy/EaselJS,markknol/EaselTS,legendvijay/EaselJS,ebabel-eu/EaselJS,mientjan/EaselTS,CreateJS/EaselJS