No Smooth Slide Annimation In Firefox Desktop Browser

I just purchased the Pro version of the plugin and so far I am happy with everything. However, I noticed that the slide menu is not animating out smoothly in Firefox (v-32.0.2) When the menu icon is clicked it just snaps out. The animation works fine in the desktop versions of Chrome and Safari as well as all the mobile versions I tested. Your demo at https://shiftnav.io/ also works fine in my version of Firefox.

I am using the Enfold theme. Outside of this issue everything seems to function properly. The strange thing is that the sub-menu animations are working in Firefox only the slide out is not working.

https://www.ads-software.com/plugins/shiftnav-responsive-mobile-menu/