Windows 7
crash [@ ns_if_addref<nsIDOMHTMLCanvasElement*>(nsIDOMHTMLCanvasElement*) ] [@ ns_if_addref<nsIRequest*>(nsIRequest*) ] [@ ns_if_addref<nsPresContext*>(nsPresContext*) ] [@ ns_if_addref<nsICancelable*>(nsICancelable*) ]
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