Firefox audio disapears and returns on Tomplay.

[globetrotterdk]

$ uname -a
FreeBSD 14.2-RELEASE-p1 FreeBSD 14.2-RELEASE-p1 GENERIC amd64

$ mixer -a | grep ^pcm
pcm0:mixer: <NVIDIA (0x0099) (HDMI/DP 8ch)> on hdaa0 (play)
pcm1:mixer: <NVIDIA (0x0099) (HDMI/DP 8ch)> on hdaa0 (play)
pcm2:mixer: <NVIDIA (0x0099) (HDMI/DP 8ch)> on hdaa0 (play)
pcm3:mixer: <Realtek ALC222 (Analog 2.0+HP/2.0)> on hdaa1 (play/rec)
pcm4:mixer: <vendor 0x1397 BEHRINGER> on uaudio0 (play/rec) (default)

I am experiencing Firefox audio disappearing and returning (so far) only when using Tomplay. This does not happen with Falkon browser (same system), nor with Firefox on GhostBSD, when I have a different computer connected to the same USB sound card. My USB sound card is a Behringer U-Phoria UMC404HD. I am using Firefox 135.0 (amd64) on my FreeBSD install, while I am using Firefox 134.0 (amd64) on GhostBSD. I do not believe that the version number is the determining factor however, as I was experiencing the same problem with Firefox 134 on FreeBSD...

[jb_daefo]

I get no sound at all in Firefox amd64, and falkon segfaults since the february upgrade(s) to kde. [ freebsd 13.3 stable ] I hope the forthcoming ICU upgrade does not break firefox! There are the ports portlint and portfmt to check Makefile syntax but I am out of time to troubleshoot either of the issues. [ firefox 135.0_2.2, falkon 24.12.2... ] and am using workarounds. ]

[jb_daefo]

falkon v 24 segfaulted, even built with debugging.
falkon v 25 also did.
I found a way to run it with --disable-gpu [ but not as its direct parameter ] which runs it, but it redraws too slow! And my browsedata.db [ ? ] I do not know how to restore into it.
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But my reason for this post is the OP issue, no sound...
sh /usr/local/etc/rc.d/sndiod onestart
and firefox plays sound ok, at least here.
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BTW mpv has audio but it is WAY TOO SLOW so as to be near unrecognizable.