Thanks, that's interesting. I thought service workers were only needed for things like offline support and background activity after a tab is closed (which is why I disabled them).

Streaming audio is a new one to me, I wonder if the same could be achieved with web workers instead. Or at least similar use cases like video calls work fine for me without service workers. See e.g. https://github.com/scottstensland/web-audio-workers-sockets