You cannot use this to download YouTube links like a Youtube-MP3 site can. I know that's what everyone is coming here for, just saving you the time.
This plugin is a pure JavaScript MP3 converter that encodes media files into MP3 format and adds ID3 Tags
It supports both local and remote files, and it uses the browser's internal engine to decode media files
The plugin also supports a custom decoder based on the FFmpeg project
It allows conversion from the right-click context menu and provides the option to stop the conversion process at any time
The plugin's change log includes improvements in conversion speed and support for MP3's ID3 Tags