Unlinker > * Rated 5 out of 5 stars

This add-on makes any internet forum so much more enjoyable. Linked images become viewable within the window you're already viewing. Just make sure not to set the auto option or else someone may post an image you might find less than appealing and you'll have to view it. Can be frightening. I, personally, just add a little button to the right of my search bar to click when I want to view all linked images. :D

This review is for a previous version of the add-on (1.5.1).