Firefox minimal Amount redirect Problem

[m3442a]

Hello,

i have a weird problem with Firefox on PS 1.7.8.6

I have set a minimal order amount of 15$ in Backoffice.

In the cart the function works without any problems. After add 15$ of product, i can click the Order Button in the cart for next page / Login Registration / Payment.

Chrome and  Safari bring me to that Site. BUT Firefox redirect me to the home site. If i deactive the minimal amount function everything works fine. Anyone have any Idea? I think there is some Cookie or Token Problem, but not sure about this, really weird for me.

Thanks for some input

Akos