That is it!
Next you need to find the media files. You can use online playlists like mixtape, or mp3 search engines like sadsteve.
The cool thing about DownloadHelper is that it recognizes media files on the pages as soon as firefox loads the page.
All you need to do is save the file to your local machine and you are done!
Downloadhelper can also convert media file formats. That is another topic for another post.
Consider donating or purchasing the upgrade version of DownloadHelper to help keep the good software updated and maintained.