Easy YouTube Video Downloader is the easiest Youtube video downloader ever, the free Firefox addon allows users to download YouTube videos in FLV, 3GP, MP4 and HD qualities.
Simply visit any Youtube video page and use the simple to use direct download buttons as shown below to start downloading videos in format of your choice i.e. - FLV, 3GP, MP3, MP4, HD and 1080p Full-HD (if available).
To be able to like, add, edit and comment on applications you must
sign in. It is a really simple operation with OpenID or Facebook Connect.