Not working on Safari Version 8.0.6 (10600.6.3) Mac OS X 10.10.3
From JS Console:
[Error] TypeError: undefined is not a function (evaluating 'Array.from(e)')
_toConsumableArray2 (app.min.js.pagespeed.ce.ozGaCBt6Kj.js, line 1)
s (app.min.js.pagespeed.ce.ozGaCBt6Kj.js, line 1)
f (app.min.js.pagespeed.ce.ozGaCBt6Kj.js, line 1)
onload (app.min.js.pagespeed.ce.ozGaCBt6Kj.js, line 1)