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question: is it possible to cache the music locally somehow so you download/stream the track only once?

The simpliest way is to play (stream) the music file using <audio> tag, the resource would be cached once you have completed the playback once. Then you can go offline and start looping.

I think you could use the CacheStorage[0] framework for this, but IIRC it's not got a great size per domain and is limited by a varying amount of 5MB to 100MB depending on browser.

[0] https://developer.mozilla.org/en-US/docs/Web/API/CacheStorag...

It looks like Firefox may be different in this regard. Chrome[0] and Edge[1] allow `unlimitedStorage` to be specified that removes the 5MB default limit.

[0] https://developer.chrome.com/docs/extensions/reference/stora...

[1] https://docs.microsoft.com/en-us/microsoft-edge/extensions-c...

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