Unplug steps in providing the technology to discover media links for mms and real media videos as well. It is also working for flv files that youtube and google video use but not that comfortable as the video downloader add-on. Once the extension is installed you can use the add-on by selecting Tools / UnPlug to scan the website automatically for media links.

A better option would be to add the unplug icon to one of your toolbars for faster access. To do that right-click a toolbar and select customize from the menu. Scroll down until you see the unplug fish and drag it to the toolbar of your choice.

Most of the time you receive a choice of possibilities that could contain the actual movie. It looks more complicated. Unplug tries to help the user by suggesting one or two of the links that it thinks are the most possible correct links to the movie.  I would use this plugin for the sites that the video downloader is not able to process.