And, yes there could be a single setting among the many, many security and advanced settings that is causing this. It could be a combination of settings. But, unless something else has changed that made this start happening (something outside of the browser), resetting the defaults as [I'm instructing now should do it].
You may have malware. You may have installed a firewall or changed its settings, anti-virus or anti-malware software or their settings.
Or, it could be the sites with the sound on them, are they the same ones as before that didn't have this issue? Give us a few addresses to check out for you. No warez or **** sites please.
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