Rated 5 out of 5 stars

Great add-on! The normal white screen that appears as the default background color when viewing images online is really bright and hard to look at. As someone suggested above, with this add-on you can change the default color to #888888.

It would be nice if when you right clicked an image, an option to "View Image in New Tab" was available.

This review is for a previous version of the add-on (0.17.1). 

Version 0.18 will have an additional ctrl+alt+richtclick shortcut to open the image in a new tab.
BTW, firefox already provides such a function: if you right click on an image, and hold down ctrl when clicking on "view image", the image will be loaded in a new tab.