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From: Michael Powell <nightrecon@hotmail.com>
Subject: Re: no sound in firefox youtube videos (HTML5)
Date: Fri, 27 Nov 2015 15:18:34 -0500
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Giuseppe Pagnoni wrote:

> Thank you very much: I rebuild firefox without selecting pulseaudio, and
> it works now!  It's not very clear to me why alsa and pulseaudio are
> incompatible (since you can select them both), but I am quite happy with
> the results.
> 
[snip]

Alsa is low level hardware and drivers. Pulseaudio is more or less an audio 
sound mixer/server that runs on top as an extra layer. Applications that are 
designed to utilize pulseaudio need to have a library or method coded to be 
able to access it. If they don't then pulseasudio being a layer in between 
will only serve to block access to the lower levels.

-Mike