SpecificFeeds seems to be broken

Hello, as the title states the specificfeeds button seems to be broken. Generated onclick handler doesn’t look valid (quotes):
onclick="window.open('http://www.specificfeeds.com/widget/emailsubscribe/MjY1MA==/OA==" ,'EmailSubscribe','toolbar=yes,location=no,status=no,menubar=no,scrollbars=no,resizable=no,width=400,height=400,left=430,top=23'); return false;"

https://wordpress.org/plugins/really-simple-facebook-twitter-share-buttons/