Well possibly there are two different problems. When I was using pandora it 
also didn't play after I resumed.
Though reloading the page, brought sound back. (BTW I use Opera, not firefox).

But besides that I sometimes experience problems that I have no idea how
to fix besides restarting the computer.

I tried to restart alsa mixer, pulse audio, unloading and loading the
kernel modules again. Nothing seemed to work when it happened.

In the volume control, after such reloading I didn't have any other
devices besides HDA Intel (Alsa mixer), so perhaps I wasn't reloading it
correctly.

-- 
[Intrepid] No sound after resuming from suspend/hibernation
https://bugs.launchpad.net/bugs/296115
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