Doesn't work properly on mozilla site

About: Standalone Image Background and Transparency [Preview]

https://addons.cdn.mozilla.net/user-media/previews/full/172/172802.png?modified=1459963435

Maybe it is related to CSP, I'm not sure.

Firefox 47.0a2
GreaseMonkey v3.7
Standalone Image Background and Transparency v9.0

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