www/firefox: no audio with youtube and in-browser videos

[O. Hartmann]

I have no audio in any video played by the browser. This "feature" was
introduced with the last port update of www/firefox, which is at the
moment of version

pkg info firefox
firefox-23.0.1,1

The operating system is 

FreeBSD 10.0-CURRENT #0 r255141: Mon Sep  2 11:12:28 CEST 2013 amd64

[firefox] make showconfig
===> The following configuration options are available for
firefox-23.0.1,1: DBUS=on: D-Bus IPC system support
     DEBUG=off: Install debug symbols
     GCONF=off: GConf configuration backend support
     GIO=on: GIO for file I/O
     GNOMEUI=off: libgnomeui support module
     GNOMEVFS2=off: GnomeVFS2 (virtual file system) support
     GSTREAMER=off: Multimedia support via GStreamer
     LIBPROXY=off: Proxy support via libproxy
     LOGGING=on: Additional log messages
     OPTIMIZED_CFLAGS=on: Use extra compiler optimizations
     PGO=off: Use Profile-Guided Optimization
     WEBRTC=on: Web Real-Time Communication
====> Options available for the single AUDIO: you have to select
exactly one of them ALSA=off: ALSA audio architecture support
     PULSEAUDIO=on: PulseAudio sound server support
===> Use 'make config' to modify these settings

If option ALSA=ON is selected, firefox crashes when trying to play
videos.


Regards,
Oliver

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