Why is Firefox not rendering "long" images correctly?

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http://askubuntu.com – When I visit webpages that have long images firefox is not rendering them correctly. It seems to be the very long pictures the cause this problem. I don't know where the breaking point is for this. You can look at the picture here the picture is on 9gag.com and they sometimes remove pictures so I've uploaded a screenshot to photobucket also. As you can see in the picture chromium is rendering the picture correctly but not firefox. I've tried deactivating all my addons without any change to the rendering. I'm using a 100/100mbit connection via a 1gbit router and the connection is my own. Is (HowTos)