"An add-on for IE and Mozilla to directly download videos from YouTube and similar sites."
If you want to be able to rip almost any embedded video no matter where it's hosted, then you need Video Download. As you can clearly tell from its name, Video Download is a free add-on for Mozilla Firefox and Internet Explorer browsers, which lets you download videos from on-line sites like YouTube, Google Video, Grinvi, and similar, with just one mouse click.
This Video Download add-on creates a link to directly download from the right click (contextual menu). You just click on it to save it in the place you want in your hard drive. That means you now have it to watch whenever you like. You can choose batch parameters for video quality, format, destination and Video Download will automatically rip videos in accordance with your settings.
The instructions to install this Video Download add-on to Mozilla Firefox and Internet Explorer you can find on the author's website. It is free, simple and very practical.