Anybody having issues please provide the URL to the playlist file otherwise no help can be provided.
By default the context menu item "Rip Playlist Contents" will only show up when you are clicking on a URL that links to a file with the .m3u or another supported file extension. On windows you must right click. On Mac you must hold the mouse button on the link until the menu displays. If you hold the CTRL key the menu option will now show up on any link.
This extension is not able to rip Shoutcast/Icecast streams. The requests expected by those types of servers have special headers which allow downloading of their content. This extension uses standard HTTP requests to retrieve files.
I've been extremely busy since developing this extension and I apologize for the lack of support...