This is an ADOBE FLASH issue, not anything else. Adoeb Flash SUCKS and it often crashes on Chess.com regardless of browser used.
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OK...here is solution (for xp but I think it's similar in other windows):
Open Your Control Panel.
Open the Internet Options
Double click on "Internet Options" to open that section of the Control Panel.
Select the "Advanced" Tab
Scroll Down to Multimedia
Deselect the Play Sounds Option.
Apply
Open again
Option called "Play Sounds in Webpages" appears.
Select it...Apply