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it's highly probable that qsynth is using the jack-audio-connection-kit and that takes exclusive ownership to the default sound device on your system. and most if not all web browsers have no direct interface to the JACK sub-system you're left with no sound from any web site or page at all.

so this is not qsynth's fault whatever. there's various solutions to your problem though, some are more elaborate and complicated than others. none have qsynth involved whatsoever. one way to go is about having pulseaudio and jack coupled together.

have a look into this other thread and the hints there given, please.

hth.
cheers