Rated 5 out of 5 stars

Works fine, and configurations run on the fly. It's weird that by default there is no single attribute in "about:config" to change that dark background.

Now I can view images on absolute neutrality: with an RGB(128,128,128) gray and without those senseless borders ruining the full-view mode.

This review is for a previous version of the add-on (2.1).