I realised today, that in Firefox (version 38.0.5) the custom fiels dropdown on the frontend (I don't know how to call it, I mean the part above the add to cart button, where you can choose the parameters for example size or color) can't be seen. In Chrome it looks normal, but in Mozilla you can not select parameters.
I was working on the test site usually with Chrome, sometimes with Firefox, never realised this problem, and I made the test site live, so I would be happy to solve this problem.
Do you have any suggestion?
See the problem for example here: http://okoanyu.hu/shop/yuuki/yuuki-soft-intimkehely-reszletek