I'm trying to teach myself to sing . Unfortunately, it was so quiet. I could not hear any sound at all. Only I know is that my sound card works well with ALSA so the problem could be firefox don't know how to deal with ALSA properly. By the way, every questions have their answers including this one. Eventually, I found a good blog since last January. I just need to install alsa-oss (already done) by sudo apt-get install alsa-oss. And then modify /etc/firefox/firefoxrc to use ALSA as below.

FIREFOX_DSP="aoss"

All done. Don't forget to restart firefox to take effect. Thanks macewan.

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