There are several add-ons for Firefox that will change the way you can interact with images and galleries, and joining that clan of extensions is OutWit Images.  It is a simple, straight to the point image browser for the browser.  It does all the catching, saving and auto-browsing for you.

The thing that makes OutWit Images different than other image browsers, is it allows user to save images right to the hard drive and browse from there.  From within Firefox, you can collect images from various web sources  with just a simple click of the button. 

The sleek design (as you can see above) is also worth pointing out.  It can also be personalized by selecting different background colors and views for the thumbnails themselves.  Here is a little more about this extension from the developers:

The images can be dragged and dropped into the collection basket, “the catch,” from which they can be saved directly onto the computer, displayed in a slideshow, or shared with others. It also offers a variety of other options including filters for viewing and saving the images, as well as, visible source information.

OutWit Images is designed for the collection of images, plain and simple.  You can pickup this add-on for Firefox on the Firefox Add-ons site or the official OutWit site too.