CSS3 animation not working in Firefox, how to fix?

Question

HTML

In general, there is a moving background in the block .
In chrome and other browsers, everything works fine, but the fox does not want to display the animation, tell me what the problem is.
I even added separate elements for it with the -moz- prefix, but it didn't help.

Answer 1

Figured it out myself. Here is the code .
It turned out that the fox is very picky.