The extension, NetVideoHunter, promises you a world of easy to download videos and music from any YouTube-like video sharing web site.  With it, you can download media from places such as YouTube, MySpace, Google Video, Metacafe, Dailymotion and more.

One more nice feature that comes with this add-on is that before you download any video or music, you can play it in a built-in media player.  It has both fullscreen and video smoothing capabilities too, to make your viewing experience just that much better.

Here is a video tutorial on how to get the most out of NetVideoHunter:

Now, truth be told – there are a lot of extensions out there that promise to make content downloading easy and painless, however many fail in a number of ways.  NetVideoHunter however, has yet to disappoint.  If you have your own favorite media downloader for Firefox, feel free to share!