Greasy Fork is available in English.
Shows the ratings from Goodreads on Amazon book pages
< Amazon - Goodreads metadataについてのフィードバック
Believe it should be working again. Please post another comment if it is still broken for you.
Working fine now just have to allow domain with the why new script works.
Not working, show large black stars and has no link. I'm guessing either amazon or goodreads have change layout.