Works great. For those unsure how it works... This is meant to work with a self-hosted instance of pinry. If you go to Manage Extensions and go to Preferences for this addon, you will see a text box to input your instances url.

Context menu and pinning now works, but when right clicking on an image I would expect that image to be selected and not have to select from all the images in the page.
Thanks for replying and fixing the issue