[Bug 1718336] [NEW] Firefox requires PulseAudio for working sound again

[Sworddragon]

Public bug reported:

I'm using Ubuntu 17.10 dev with Firefox 55.0.2+build1-0ubuntu4 and
Firefox requires PulseAudio for working sound again. This is a
regression of
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1671273 and there
is a report at https://bugs.launchpad.net/ubuntu/+source/lubuntu-
meta/+bug/1710993 but it seems to be Lubuntu-specific.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  Firefox requires PulseAudio for working sound again

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