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How to get script to work?

I installed the script using greasemonkey on Firefox, and it doesn't seem to work. The entries on the bookmark list just get bigger, but it doesn't show thumbnails. I've attached a screencapture for reference.

Look like it does not work under greasemonkey, but Tampermonkey for firefox works. But i dont know when i am going or if it possible to fix this.

PS: the same thing happens with kissmangalist and kissanimelist