Firefox has no sound after updating to version 52. I am using Debian/Bunsenlabs with ALSA as my main sounddriver.
Is it possible to get Firefox play sound without installing PulseAudio?
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So in version 52, Firefox ships with pulseaudio only out of the box. You can still compile firefox yourself with ALSA. Some distro's re-enabled it again, some chose not to because they are afraid it will break soon now Mozilla is not supporting it.
People saying Firefox ESR 52 does support ALSA. I just installed it, I can confirm it doesnt.
Me, I am fed up with firefox. First the DRM (netflix) ordeal, now dropping ALSA support. Which forces us to use Pulseaudio. I am jumping ship to Chrome.