Summary: although pulse nowadays usually works, the overall system
is still fragile. If anybody has any further suggestions for
getting pulse to work reliably with firefox, please speak up!.
At the moment alsa is still recognized as an option, but I don't
know if that will continue.
It turns out: I had 700 permissions on some /usr/share/ and /etc pulse
related directories. By giving these directories 755 I was somehow able
to make sound possible in firefox. I am still in the dark however about
the entire relationship between dbus and pulseaudio and the general
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