Background music in games is typically mp3/ogg/aac/etc track, sound effects are mostly use wav format or similar. As for me it seems that some codecs are missed, for example music could use wma or some other format that is not installed by default. You can try to install FFmpeg, or VLC which contain many audio/video codecs.
It's a complicated project. You should take it to some parts. It's my suggestion and would be happy if other experts improve it.
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Try playing the downloaded file with Firefox using File->Open.
If doesn't work, check that you have the AAC codecs installed using ffmpeg -codecs.
If playing the local file does work, then, as outlined here you should start Firefox with MOZ_DISABLE_CONTENT_SANDBOX=1 env variable, or whitelist the directory where the codec libraries are located in, e.g. ...
If you have a significant hardware issue, this may stop the Pi from loading. Make sure the sound card is plugged in correctly to the Pi's GPIO header. If you plug the card in and the Pi boots (before you have run the software setup) then it is most likely that it is not a hardware issue.
For software issues, perhaps it is easier to manually setup the card, ...
Okay, I found the answer myself. I feel very dumb of not trying this out, but here is the A:
Without selecting an output device, I just turned the volume to 100% and hit play on VLC. Ta-da.........
I can't believe I didn't think of trying this out.
You can set the cards by configuring /usr/share/alsa/alsa.conf. Therefore, change it according to the value below.