Thanks. At that page, without following a link to any other page at the site, there are a few videos, and a podcast. Playback for even a split-second will leave audio in use by a Firefox process after playback ceases. For example:
Code:
root@mowa219-gjp4-8570p:~ # fstat | grep -e dsp -e mixer | grep firefox
grahampe firefox 35866 73 /dev 95 crw-rw-rw- dsp1.0 w
root@mowa219-gjp4-8570p:~ #