Optional
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.
Checks a custom content security policy string, to ensure that it meets minimum security requirements. Returns null for valid policies, or a string describing the error for invalid policies.
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This interface exposes functionality related to add-on content policy enforcement.