No longer get sound from duolingo

[Dan Healy]

I use duolingo and kahn academy every day.  Today I couldn't get sound out
of duolingo.  I am using the latest release of ubuntu 14.04 and firefox
39.0.  I think the sound failed after the latest ubuntu update.  The sound
with kahn academy is fine, only duolingo failed today and it worked
yesterday.

Thanks for your help,

Dan H
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