I do similar things, but a few weeks ago I had to learn, that many of the issues I had with the online Spotify Player (slow loading times, incomplete pages, not

I do similar things, but a few weeks ago I had to learn, that many of the issues I had with the online Spotify Player (slow loading times, incomplete pages, not playing music) were caused by the included ServiceWorker. Gladly I could disable it in my Firefox Profile and now everything works just fine. Maybe the local version wouldn't have had that problem.