--- firefox-bin-52.0.1.ebuild	2017-04-11 19:40:43.769165993 +0200
+++ firefox-bin-52.0.1-r1.ebuild	2017-04-11 19:39:16.511441266 +0200
@@ -31,7 +31,7 @@
 KEYWORDS="-* ~amd64 ~x86"
 SLOT="0"
 LICENSE="MPL-2.0 GPL-2 LGPL-2.1"
-IUSE="selinux startup-notification"
+IUSE="apulse pulseaudio selinux startup-notification"
 
 DEPEND="app-arch/unzip"
 RDEPEND="dev-libs/atk
@@ -54,6 +54,8 @@
 	x11-libs/libXt
 	>=x11-libs/pango-1.22.0
 	virtual/freedesktop-icon-theme
+	apulse? ( >=media-sound/apulse-0.1.9 )
+	pulseaudio? ( media-sound/pulseaudio )
 	selinux? ( sec-policy/selinux-mozilla )
 "
 
@@ -134,8 +136,12 @@
 	unset LD_PRELOAD
 	LD_LIBRARY_PATH="/opt/firefox/"
 	GTK_PATH=/usr/lib/gtk-2.0/
-	exec /opt/${MOZ_PN}/${MOZ_PN} "\$@"
 	EOF
+	if use apulse; then
+		echo "apulse /opt/${MOZ_PN}/${MOZ_PN} \"\$@\"" >>"${ED}"usr/bin/${PN}
+	else
+		echo "exec /opt/${MOZ_PN}/${MOZ_PN} \"\$@\"" >>"${ED}"usr/bin/${PN}
+	fi
 	fperms 0755 /usr/bin/${PN}
 
 	# revdep-rebuild entry
@@ -162,7 +168,12 @@
 		einfo "gnome-base/orbit and net-misc/curl emerged."
 		einfo
 	fi
-	einfo "For HTML5 video you need media-video/ffmpeg installed."
+	if ! has_version 'media-video/ffmpeg'; then
+		einfo "For HTML5 video you need media-video/ffmpeg installed."
+	fi
+	if ! use apulse && ! use pulseaudio; then
+		einfo "For HTML sound you need to enable apulse or pulseaudio"
+	fi
 
 	# Drop requirement of curl not built with nss as it's not necessary anymore
 	#if has_version 'net-misc/curl[nss]'; then