This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
JSObjectOps is not a supported API. Details of the API may change from one release to the next. This documentation should be considered SpiderMonkey internals documentation, not API documentation. See bug 408416 for details.
JSObjectOps.destroyObjectMap callback is called to destroy a
JSObjectMap when its reference count goes to zero.
typedef void (*JSObjectMapOp)(JSContext *cx, JSObjectMap *map);
||Pointer to the JS context in which garbage collection is happening.|
||The map to destroy.|