stracing the pulseaudio process shows that it's not doing anything. Killing the pulseaudio process unstucks Firefox. If, instead of killing pulseaudio I kill Firefox instead, the pulseaudio process pegs itself to 100% CPU. Bad karma.
Downgraded to pulseaudio-0.9.19, everything's ok now.Weren't there a few intermediate releases of pulseaudio? The updates directory seems to keep only the most recent update of each package. I would've downgraded to the previous errata release, but there weren't none, so I had to roll back to the initial F12 package.
Someone else already reported pulseaudio breakage in bug 559032, but later followed up with a mea culpa thinking that it was his flash that was broken. But I do believe that there's a pulseaudio bug here, so I provided more info to reproduce this bug.
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