ImgScoop by dvogel

This extension is designed to be installed in a specialized Firefox profile used for downloading images. When you cursor over a linked image you will get a colorful outline. You have a few quick keyboard shortcuts at your fingertips:

• Press "w" to widen the outline to include surrounding images.
• Press "Shift-T" to open each image in a new tab.
• Press "d" to download the media under the cursor.

When viewing an image on it's own, you can press "Shift-Space" to download the image without being prompted for a save location. All images are downloaded to a folder named for the site it was downloaded from.