Greasy Fork is available in English.
Redirects any Amazon shopping site to its Smile representation
An edit of HolgerZ's script to only redirect when the smile page actually exists
"This Script redirects any Amazon Shopping Site to its Smile representation.
Other Amazon sites will not be redirected.
It is written with a Tampermonkey feature where i don't know if it is available in other script manangers.
It leaves (i)Frames created by smile.amazon the way they're created."