This is the tar.xz of version 28.7.1, the stevenpusser debian repo version 28.8.0, and the source with --disable-pulseaudio and --enable-alsa of version 28.8.0.
In all versions when I check about:support it always says Audio Backend: alsa.
I've tried Preferences -> Advanced -> Use hardware acceleration when available enabled and disabled, User Agent Mode: Firefox Compatibility, and Native. Preferences -> Content -> Enable Media Source Extensions (MSE) disabled and enabled.
Vivaldi works fine, vlc works fine, mplayer works fine, you get the idea.
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prompt$ aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
jack
JACK Audio Connection Kit
sysdefault:CARD=NVidia_2
HDA NVidia, ALC262 Analog
Default Audio Device
front:CARD=NVidia_2,DEV=0
HDA NVidia, ALC262 Analog
Front speakers
...
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prompt$ aplay -l
card 0: NVidia_2 [HDA NVidia], device 0: ALC262 Analog [ALC262 Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: NVidia_2 [HDA NVidia], device 1: ALC262 Digital [ALC262 Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
...
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prompt$ cat asound.conf
pcm.!default {
type hw
card NVidia_2
device 0
}
ctl.!default {
type hw
card NVidia_2
}