Doesn't work on Firefox 43.0.4 on Windows 10 Professional.

[dstN]

i tried using this script and discovered that it's not working on current FF with Windows 10 Prof. it doesn't add the class "open" to the element.

Can't try on mobile, cause i'm using a offCanvasmenu on Mobile, and this is working.

But tried several other browsers:
Edge: working like a charm.
Chrome (V: 47.0.2526.111m): working like a charm.
IE-9/10/11: working like a charm.
IE8 and below: well.. not even my nav is working so, i don't know. :)
Opera 34: working like a charm.

[CWSpear]

Does this sound like it's related to #68? Does your machine have touch enabled?

[dstN]

could be possible. i'm on windows 10 and win10 is touch-first-optimized. but my machine doesn't even has a touchscreen.