10/22/2013 8:22:05 AM
This is a crash of the Silverlight plugin itself
I suggest they try to update Firefox via its Help/About dialog (has update button there, at least the Windows version does so)
Also could look into installing updates for the MacOS-X itself or try to uninstall and reinstall the Silverlight plugin.
However if at Safari plays fine on that machine, should only try to update Firefox
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