In the strain of the most recent update of www/firefox, on CURRENT the audio capability is gone! Firefox does not paly any kind of audio. Config is ports standard:
===> The following configuration options are available for firefox-45.0.1_3,1:
BUNDLED_CAIRO=on: Use bundled fork of cairo-1.9.5
CANBERRA=off: Sound theme alerts
DBUS=on: D-Bus IPC system support
DEBUG=off: Build with debugging support
DTRACE=on: Build with DTrace probes
FFMPEG=on: FFmpeg support (WMA, AIFF, AC3, APE...)
GCONF=off: GConf configuration backend support
GIO=on: Use GIO for file I/O
GNOMEUI=off: libgnomeui support module
INTEGER_SAMPLES=off: Integer audio sample format
LIBPROXY=off: Proxy support via libproxy
OPTIMIZED_CFLAGS=on: Use extra compiler optimizations
PGO=off: Use Profile-Guided Optimization
PROFILE=off: Build with profiling support
RUST=on: Build with components written in Rust language
TEST=off: Build and/or run tests
====> Options available for the multi AUDIO: you have to choose at least one of
them
ALSA=on: ALSA audio architecture support
PULSEAUDIO=on: PulseAudio sound server support
====> Options available for the single TOOLKIT: you have to select exactly one
of them
GTK2=off: GTK+ 2 GUI toolkit support
GTK3=on: GTK+ 3 GUI toolkit support
===> Use 'make config' to modify these settings
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