Google map marker and firefox

Hi,

I got a little problem with the custom google map marker and firefox.
I have a custom marker (80×80) and set the size to 80×80.

In firefox it puts the marker to 40×40 in the other browsers its working fine.
I did some digging in the code and found out that the retina part is the problem (i don’t have a retina screen)
if(_self.retina && size > 40) size = 40;
but its strange that only firefox is having a problem with that part of the code

I use Firefox 43.0.4, enfold 3.4.7

Can you help me with finding a solution?
Thanks,

Arjan