It works! One addition I would like to see is to be able to whitelist certain sites.

Works as expected. I would like to see a feature that blocks all images on a listed domain automatically, as constantly toggling it on and off for a website I use frequently and every other site is a bit annoying.

any chance you could add a blur instead of a complete block?

I like this add-on, the only thing missing is the possibility to add pages exclusion, when you want to have a page with image without to disable the tool, and the second thing is the option to enable the add-on in block image mode when Firefox start (By default, the add-on start with the permission to see images)

Faster browsing and no distractions, but should remove more image kinds.