i have installed firefox from the latest repository and had the bug that i couldn't hear anything at soundcloud.com then I wanted to check if pulseaudio was running but pulseaudio wasn't pulled even though it should be installed, right?
In any case soundcloud is working again by installing pulseaudio by hand.
- Lazy bindings (libpulse.so is loaded via dlopen)
- ALSA/SNDIO is good enough for playback-only
- WebRTC wasn't popular until a few years ago
- Vocal minority (bug 216383)
Firefox didn't have sound probably because the backend selected by default wasn't configured properly. Did you read pkg-message?
For probing order see https://searchfox.org/mozilla-central/rev/06985b12a4ab/media/libcubeb/src/cubeb.c#188-226
All right, thanks for the explanation.