Fastest Tube - Another alternative way to download your video using plugins or add on for all major browser. It helps user to download videos in major video format like Mp4, FLV. As mentioned it supports all major browser such as IE, Firefox, Safari, Opera and Google Chrome.
When you visit your favorite youtube video, below the video you can see a new tab named “Download”. Just click on it and download the video by selecting your preferred file format and resolution.
I haven’t try though this plugins and for those who has tried it, Let me know.