Web video downloader for Firefox, a free intelligent Firefox extension, can capture videos and download FLV videos from YouTube and other video sharing sites. With one-click, it can download videos with of various formats including FLV, WMV, ASF, AVI, MOV, RM, RMVB, etc. The video downloader also displays latest hot video information without surfing all video sharing sites. It is a really good video download assistant for offline video enjoyment.