This is a somewhat special interface. It is available from the global nsIXPConnect object when native methods have been called. It is only relevant to the currently called native method on the given JSContext/thread. Holding a reference past that time (or while other native methods are being called) will not assure access to this data.
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Attributes
Set this if JS_SetPendingException has been called. Return NS_OK or else this will be ignored and the native method's nsresult will be converted into an exception and thrown into JS as is the normal case.
This may be NULL if the JS caller is ignoring the result of the call.
