Fetches spotify data-ids from Spotify's http page. The list is then sent to spotify-to-mp3 ruby gem to download via Grooveshark. And that is how you download songs from spotify.

fetch-spotify-dataid.js

items = document.getElementsByClassName('play-track');
for(i= 0; i<items.length;i++) {console.log('http://open.spotify.com/track/' + items[i].getAttribute('data-id'));}