У вашего броузера проблема в совместимости с HTML5
Learn How to Turn off the Avast Voice Notification.
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In this video tutorial we will show you how to turn off the avast voice notification.
Right-click on the Avast icon and choose "Open avast! user interface".
In following window, choose "Settings".
In the next window, click on the "Sounds" tab. Uncheck "Use voiceover sounds". Then press "Ok".