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Thanks for this handy script!
I'm not sure if or which smile exists on other domains. In the US, it exists:
// @include http://smile.amazon.com/*
// @include https://smile.amazon.com/*
// @include http://www.amazon.com/*
// @include https://www.amazon.com/*
Thanks, I will add it
https://github.com/cvzi/Rottentomatoes-userscript/issues/4
Added