Flickr Original is a Firefox add-on for downloading full sized images from Flickr quickly and easily. To download an image from Flickr in its original size, normally you required 3 or 4 clicks. Flickr Original saves this, just right-click on the thumbnail you want to download full-size and select "Download Original Flickr Image from the context menu.

Features of Flickr Original (Version 1.0.1) - ‘View Original Flickr Image’ option in context menu, so that you can see the original sized image before downloading and ‘View’ and ‘download’ options only show up on valid Flickr photos.

After installing the add-on, just right-click on the thumbnail you want to download full-size and select "Download Original Flickr Image" while you are on Flickr. This won't work on images that the photographer has marked "All Rights Reserved" or has disabled downloading. More details and download