[Osiris]

Piclens is a great Firefox extension that adds image viewer capabilities to Firefox. It adds a full screen display on supported sites showing the selected image plus all other images in a thumbnail bar at the bottom. The extension does not work on all sites but on some major ones such as Flickr, Facebook, Google Images, Yahoo Images, Friendster, Picase Web Albums and RSS Media Feeds.
If you hang out at these sites you should definitely consider trying and using Piclens to enhance your viewing experience. Piclens adds a little ‘play’ icon in the lower left corner of every image which starts the full screen image viewer showing the selected image in full screen mode.

It is then possible to navigate the images using your mouse or the cursor keys. A slideshow has been implemented as well which displays all images one after the other.
A click on the > icon in the top left corner loads the website the image is hosted on which could be different from the website that you started Piclens with.
Piclens supports multi-page search results when you use it to view images at Google Images or Yahoo images. Basically a way to browse all pictures at once without the need to click to load the next batch of results.

Read More:
Piclens Homepage