Technically, yes, but it doesn't do what you expect. I built it to help in development and support people moving from the sideloaded extension to the web store extension -- you need to have two pages open from two separate versions of the extension, then drag between them.
I've already removed it from the next version since it's misleading. As far as exporting your autoplaylists for iTunes, I think it'd be easier to go through Google Music directly. You can probably find a script biult with
https://github.com/simon-weber/gmusicapi to export to m3us or something similar.