If you ever wanted to save a funny or cool Youtube video, then DownloadHelper is a must have.
DownloadHelper is a free Firefox extension for downloading and converting videos from many sites with minimum effort.
Just surf the Web as you are used to, when DownloadHelper detects it can do something for you, the icon gets animated and a menu allows you to download files by simply clicking an item.
For instance, if you go to a YouTube page, you’ll be able to download the video directly on your file system. It also works with MySpace, Google videos, DailyMotion, MegaVideo, iFilm, National Geographic and others.
Click here to see the full list of video sites that it supports.
In fact I was able to download from any site that had embedded video (If the download icon is ‘grayed out’ then play the video for a few seconds and it should become downloadable).
Download DownloadHelper for Firefox