DefinePropertyIfFound, in xpcwrappednativejsops.cpp, currently passes nsnull to the getter and setter parameters of OBJ_DEFINE_PROPERTY. if(member->IsMethod()) { ... OBJ_DEFINE_PROPERTY(ccx, obj, id, funval, nsnull, nsnull, propFlags, nsnull); } This means the new property adopts the class's getter and setter. DOM quick stubs copies this behavior. mrbkap suggests instead using JSFUN_STUB_GSOPS when defining quick stubs for methods, so that the property will get JS_PropertyStub for its getter and setter. Assuming the behavior is correct, it'll definitely be faster. Maybe the idea generalizes to all XPCWrappedNative methods.

I think this is INVALID. Looking in xpcwrappednativejsops.cpp, all the _Proto_ classes already have the stub getter.