Currently used audio backend can be inspected on about:support page.
Supported backends and default probing order is as follows:
pulse-rust if pulseaudio package is installed (PULSEAUDIO option)jack if jackit package is installed (JACK option)sndio if sndio package is installed (SNDIO option)alsa if alsa-lib package is installed (ALSA option)oss (always available)To force a specific backend open about:config page and create
media.cubeb.backend preference.
To disable the automatically search option in the URL bar, set keyword.enabled on false.