I am using KDE on a desktop computer with AMD processor. 
I am using packman packages to be able to play the restricted formats for years
and every thing worked well until recently.
After last updates of packages my Firefox does not produce any sound when I am
opening web content with movies or sounds. 
Google Chrome or Falcon plus Clementine and many other software on the same
computer are working well with same content or by playing music.
I have checked in Internet all possible ideas to solve this problem of Firefox
and try them but no luck so far.
Could you please announce any work around if you know such for this problem and
possibly solve this problem by some future patch?