Works great, until May 9th or so. FireFox updated to 60.0 and now SCDL doesn't work anymore. The buttons do nothing. I've restarted firefox, removed SCDL from firefox, re-added SCDL and it worked until I closed the soundcloud tab or refreshed it. My UBlock never ever affected SCDL, so that can't be it. I even disabled UBlock with the page open. Still doesn't work. Please update your app. Thanks.