Using FF version 126.0.1.
Right clicking amazon product listing is supposed to add page to comparison, but it does nothing. Icon still issues message, "No products added." This plugin is utterly useless. Would give zero stars if that was possible.

It doesn't work, I believe it worth 0 star

Fails entirely to function as advertised, either on amazon.co.uk or amazon.com. As noted in other reviews, selecting "Add to comparison" from the right-click context menu appears to do nothing whatsoever.

Doesn't work. Right click on product page or link to and select "Add to Comparison" then click on the add-on button to view comparisons, and it says "No products added to comparison". Complete fail.

I found it wonderful... presents a detailed, sectionwise comparison

Not sure why I have to download an add-on to use a basic feature. Does what I needed it to, compares price, dimensions, and the rest of the product descriptions.