I use this setup: http://forum.slitaz.org/topic/issue-with-pulseaudio#post-37164
Firefox >=52.0 sound requires pulseaudio(2 posts) (2 voices)
No "/etc/pulse" on your system?
Install pulseaudio package and follow the instructions by @mojo.
- - - - -
If it doesn't work for you. An alternative.
01. Install apulse package.
02. Edit the firefox launcher in "/usr/share/applications".
03. Find the line: Exec=firefox-official %u
04, And edit to: Exec=/usr/bin/apulse firefox-official %u
05. Save the file and test on youtube.
!! My test was successful in SliTaz Rolling with youtube.
!! Rolling "19 Mar 2017" Release. An alternative to the moment.
Mozilla Support Community - Announcement to Firefox 52.
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