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Package firefox-official-xx (62.0.3) sound was not working. Requires pulseaudio.
I installed pulseaudio and pavucontrol and following the instructions of @mojo
http://forum.slitaz.org/topic/issue-with-pulseaudio#post-37164
http://forum.slitaz.org/topic/firefox-520-audio-requires-pulseaudio#post-44307
Now pulseaudio works.
Now firefox-official-xx updated to version 63.0.1 and audio working Ok!
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We should have a Slitaz version with all those things already included and fixed once for all.
Hey folks - new user here.
(I've sparingly used SliTaz several times, off & on, over the past few years.)
I've created a bug report, below... IMHO perhaps one approach could be:
http://bugs.slitaz.org/bugs.cgi?id=212
Does this all make sense?
Clear as mud? ;p
thanks for everyone who's been supportive of troubleshooting, fixing, reporting, documenting and publicizing this!
~ joseph
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libcanberra-gtk.so.0 is missing for pavucontrol --> needs libcanberra-gtk2 package,
pavucontrol (pulse audio colume control) .. why the hell this crap has to connect to something ?
firefox auto-updated to 63.0.3 but still no sound
@jwmh. Thx, nice idea
@moulefrite pavucontrol is not strictly necessary for sound to work in Firefox. You only need pulseaudio and replace the complete configuration with the content described in the post
I inform that with this method the sound works, but after a few minutes there is a severe distortion in the audio.
Transient solution close firefox and restart 
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I remember Firefox Light , one should have an official package of it's latest version before it switched to gtk3 and that unecessary pulseaudio
Two solutions for missing sound:
1) apulse
Under some conditions it works out of the box. But often you have
to modify firefox (there are several contributions, how to do) and
add lines like APULSE_PLAYBACK_DEVICE...
2) pulseaudio
I compiled pulseaudio 4.0 with alsa-developer-files. Then edit the
.../pulse/default.pa:
uncomment the lines
#load-module module-alsa-sink
#load-module module-alsa-source device=hw:1,0
comment the lines .fail
pulseaudio -D
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