fwiw, the two commands to make it work again are:

/etc/init.d/alsa-utils reset
or 
killall pulseaudio

i'm not sure if the fact that both of these commands work to resolve the
problem helps to isolate it. my very limited understanding of the ubuntu
sound system says that alsa-utils is a subset of pulseaudio, so the
conclusion would be that the problem is alsa and not pulse, since
bouncing pulse also bounces alsa, but bouncing alsa, does not bounce
pulse.

-- 
alsa plugin for browsers regularly stops working
https://bugs.launchpad.net/bugs/528661
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