Nice addon, not rhe nicest, unfortunately.
I'll put a short example here to explain.

If I'm on a Amazon page and select "Copy clean link", it copies somthing like this:

https:\\www.amazon.it/My-Favorite-Product/dp/B0CQTH64VL/ref=sr_1_6?__mk_it_IT=%C3%85M%C3%85%C5%BD%C3%95%C3%91


Unfortunately that's not the cleanest form of that link, as the "ref=" part is still present;
for instance, the same product page would be reachable also with this (shorter & cleaner) link:

https:\\www.amazon.it/My-Favorite-Product/dp/B0CQTH64VL

Hope this can be implemented, this addon is very useful! :-)

(Please note, I had to convert the slashes in the posted URL to be able to keep it, otherwise I would have not be able to post them. Sorry for this, Mozilla :-)