CentOS 7 + MATE : no sound in Firefox

[Nicolas Kovacs <info@xxxxxxxxxxxxx>]

Hi,

I recently switched my main workstation running CentOS 7 from KDE to
MATE. Migration went well, but now I have a couple issues. First things
first.

I have no sound in the Firefox browser. Applications like Audacious, VLC
or MPlayer have sound, but Firefox is mute.

Any idea how I can fix that?

Cheers,

Niki
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