Cooliris (formerly PicLens) from Cooliris.com :

1223343069 It is the most dramatic extension of FireFox. Cooliris is an interface for presenting search results of pictures or videos that takes the form of a wall of pictures in full screen 3D. Apart from its striking look, it is very effective for searching images on Google, Flickr and consors. It is possible to share the results of your investigations with your contacts. An extension is imperative to try, if only to enjoy its graphics rendering.

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Video DownloadHelper from DownloadHelper :

1215000176 DownloadHelper helps you extract Web content directly to your computer. To do this is simple: when a video or an image is detected by DownloadHelper, a button on the menu bar comes to life and offers to save the location of your choice. This extension works with YouTube, MySpace, Google videos, DailyMotion ...

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FireShot from Evgeny Suslikov :

fireshot_thumb FireShot is the ultimate tool for capturing Web pages in the form of PNG, JPEG or BMP. In a very simple use, integration is a model. This tool is in effect with a real editor. But if its primary function is to make the catch of web pages in the form of images, it also proposes to annotate, modify, export, organize, send to contacts and printing.  a tool that really works.

To download, click here