Readonly
browserDOMWindowOptional
aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
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browserDOMWindow provides access to yet another layer of utility functions implemented by chrome script. It will be null for DOMWindows not corresponding to browsers.