Sothink Web Video Downloader for Firefox is a simple and small Firefox extension for you to quickly capture and download Web videos and Flash files from internet, including flv, swf, wmv, asf, avi, mov, rm, rmvb, embedded Flash videos, Flash games, etc. It can work as a video downloader to help you collect fabulous videos from video sites like YouTube with ease. It also provides a free FLV Player to play downloaded FLV video offline conveniently.