nãpo consigo comprar no amazom, quando vou fazer a compra aparece que o vendedor não pode me enviar o produto

Malware. Redirects you from Amazon to a page affiliated to the extension's author.

Same experience as niko.delarich: the addon sometimes redirects from Amazon to Gearbest. This is malware.

REPORTED MALWARE - this addon occasionally redirects me from amazon to gearbest with the authors (?) affiliate ID.

Useful sometimes, but it injects code in pages where it souldn't be.
As web developer using CRM's, I often find injected code in these pages, they report as changed and it is possible to deliver it in live systems if not careful. A mess.