Chance is you have already stumbled upon a few websites that are posting images as links or thumbnails. The only way to view the full images would be to click on the links to be taken to another page or website where the images are then displayed in their normal resolution. The majority of users might have experienced those links on web forums, directories or blog posts.
Unlinker is a Firefox add-on that can display full images on the very same pages the image links or thumbnails have been posted thus eliminating the need to click on the images to view them in full resolution. There are two ways to make the add-on work after installation. It integrates itself in the right-click menu of the Firefox web browser. Users who want to view the full sized images on the active page may therefor right-click on that page and select the Unlinker option from the menu.
The second option is to customize one of the toolbars of the Firefox web browser and drag and drop the Unlinker add-on on one of them to be able to access the functionality with a left-click as well.

Unlinker is available for the Firefox web browser. It can be directly downloaded from the Mozilla Firefox add-on repository.
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Hi Martin,
Also take a look at “Display Original Image” – http://userscripts.org/scripts/show/47917