Here is how I fixed it:
gksudo gedit /etc/asound.conf
Paste in the following:
pcm.pulse {
type pulse
}
ctl.pulse {
type pulse
}
pcm.!default {
type pulse
}
ctl.!default {
type pulse
}
--
Sound stops working in Firefox once other applications (Pidgin, Rhythmbox) have
played sound
https://bugs.launchpad.net/bugs/183917
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