firefox mp3 no sound

vad

Hello!  
Orange PiPlus + Debian 0.9.1 from this site (Ubuntu tried too)
I have to use firefox for a site, containing mp3 files.  These files are OK in smplayer (it means all necessary codecs are in system).
Qupzilla sounds OK too, no problem to hear mp3. But it crashes sometimes, as well as chromium, so only FF is suitable for me.
  
I tried FF ver51 from Ubuntu and FF-ESR ver46 from Debian.   Youtube sounds OK, but mp3 files have some special issue.
Pavucontrol is checked,  ffmpeg and gstreamer libraries are installed from repo.
So the question is:  What is the difference of OrangePi Debian/Ubuntu  from desktop i386/x64 releases in mp3 sound  realisation?

I understand it means a lack of some libs here,  but how to resolve it?   
Thank you in advance!

CALEB

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Fillis

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欧联112

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