With this firefox extension, you can convert a YouTube video and make it an MP3. This is a simple extension for Firefox that you download and install. This add-on will add a link to download the MP3 from the video clip, once it is converted, and this may take some time. Please note that this Firefox is experimental, so you have to login to Mozilla before you can install it. The site that will do the conversion is actually located here. All you have to do is to supply it with the actual YouTube URL, including the string for this unique video clip.