I am experiencing an error in Firefox with elements that flip on hover. (The error can be seen in the attached screenshot).
The elements are css only, using box shadow, border-radius and things like
(*-)transform-style: preserve-3d;
(*-)transition: all .5s cubic-bezier(.8,.1,.3,.9);
(*-)perspective: 600px;
(*-)transform: rotateY( 0deg );
I could not find out why this error occurs, any ideas?

Additionally sometimes there is an error with the shadow.

Cheers,
Lukas
It seems to have been fixed with the new Firefox build.