From owner-freebsd-users-jp@freebsd.org  Tue Jun 26 11:27:25 2018
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From: Kouichi Hirabayashi <kh@mogami.com>
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遅くなりましたが、FreeBSD-10.3 の firefox で音が出ない問題は
解明できました。

この問題が起きる条件は次のとおりです。

 1) MotherBoard か VideoCard に sound 機能が含まれている

 2) ports/audio/pulseaudio が install されていて、かつ
    sysctl hw.snd.default_unit=3 など 0 以外を使っている

原因は ports/audio/pulseaudio の Default Sink が
sysctl hw.snd.default_unit=0 を前提にしているためで、

 1) ports/audio/pulseaudio を deinstall するか
 2) https://svnweb.freebsd.org/ports/head/audio/pulseaudio/files/patch-src_modules_module-detect.c?revision=425812&view=markup
    の patch を(手作業で)適用する

で解決します。

平林 浩一