Shop Companion Browser Add-On

The Shop Companion Browser Add-On improves numerous shopping sites. It adds an unobtrusive button panel with handy links to full-size product images, and allows you to bookmark products to your personal collections here on evrybase. This way, you'll never forget the stuff you want, or you can display the things you own.

As it seems, the Shop Companion Add-On is not installed.
You can get it here:

Add to Chrome
Add to Firefox

Also on:
Chrome Extensions (Chrome)
Mozilla Add-ons (Firefox)
Github (Firefox, Greasemonkey)
Greasy Fork (Greasemonkey)
OpenUserJS (Greasemonkey)