Hi, if this queries must go to some other specific places (forums, AUR, etc.) please let me know so I move them there. 1. According to the instructions in [1] «it is necessary to exclude /dev/snd/ from Firefox' sandboxing by adding it to the comma-separated list in about:config → security.sandbox.content.write_path_whitelist», but right now I'm using '$ apulse firefox' without that exclusion and seems to work fine. Maybe that's outdated? (My system is updated.) 2. According to [2] «to allow ALSA programs to play while JACK is running edit (or create) /etc/asound.conf» with this: # convert alsa API over jack API # use it with # % aplay foo.wav # use this as default pcm.!default { type plug slave.pcm "jack" hint.description "Jack Audio" } Now, when I installed apulse, I got this instruction: «For using PulseAudio emulation create a proper .asoundrc: $ cp /usr/share/apulse/asoundrc.sample ~/.asoundrc». Is there any relation or conflict between those two files? BTW, I simply forgot to follow that apulse indication, but it seems to work fine anyway. Maybe it's not necessary? Thanks a lot. [1] https://wiki.archlinux.org/index.php/Firefox#Multimedia_playback [2] https://wiki.archlinux.org/index.php/JACK_Audio_Connection_Kit#Playing_nice_...