Firefox not always showing animated gif images.

CyberKiller il y a 6 ans mis à jour par Kangenwater Spray il y a 5 ans 1
example: http://imgur.com/gallery/Gbd7h
This page shows all images in IE and Chrome but not in Firefox.
Tried a blank test profile and tried the beta version of Firefox but it still doesn't work.
Seems to be working fine on Firefox 34 now, not sure if imgur fixed it on their end or not.