onZoom Event not firing properly in Mozilla

Hi,

I am trying to sync the bottom chart on the basis of zoom performed on top chart.

In Chrome and IE things work fine, but in Mozilla Firefox the event does not fire properly.

Please find the fiddle to validate the issue: http://jsfiddle.net/ankitarora1990/jeox2551/show/

Please suggest if there can be any solution.

Thanks
Ankit Arora