https://addons.mozilla.org/en-US/firefox/addon/5579
PicLens - it basically turns a number of image sites into Cover Flow view from iTunes when you click the small play button on an image.
It's so much easier and sleeker to browse sites like google image search, facebook, myspace, flickr, deviantArt, etc..
It loads someone's entire gallery and let you swoop through it really fast. Double click on the image to zoom in and load in high quality
Just thought I'd pass it on
(Also works for Safari and IE)