I presume this is not a Firefox only issue, but present in all sound related calls.
Log does not show any error for this.
Inxi output is a bit off though, both pipewire & pulseaudio are set to active:
Audio:
Device-1: Intel Sunrise Point-LP HD Audio vendor: Lenovo ThinkPad X1 Carbon 5th Gen
driver: snd_hda_intel v: kernel bus-ID: 00:1f.3
API: ALSA v: k6.9.9-1 status: kernel-api
Server-1: JACK v: 1.9.22 status: off
Server-2: PipeWire v: 1.2.2 status: active
Server-3: PulseAudio v: 17.0 status: active
server 3 should be off (and really should be using pipewire-pulse). What made you activate both?
Probably not related, but you have a ton of non-repo packages on your system (see the pacman -Qm output), seems none of those are self build, but are packages no longer in the KaOS repositories, you might want to clean those up.
