1)   Sothink Web Video Downloader for Firefox 5.7
Web Video Downloader for Firefox is a free FLV video download tool. This video downloader can fast download YouTube videos and also download videos from other sites; always transfer latest video information without browsing all video sharing sites.

 2)   Wondershare Free YouTube Downloader 1.3.5.4
Wondershare Free YouTube downloader is a very easy to use Youtube video download tool. It has the complete functions to download YouTube video, archive Youtube video to your computer as you want.

 3)   Web Video Downloader for Firefox (Mac) 5.7
Web Video Downloader for Firefox is a free FLV video download tool. This video downloader can fast download YouTube videos and videos from other sites; synchronize new videos with video download page; and always provide hottest video information.

 4)   Web Video Downloader for Firefox (Linux) 5.7
Web Video Downloader for Firefox is a free FLV video download tool. This video downloader can fast download YouTube videos and also download videos from other sites; always transfer latest video information without browsing all video sharing sites.