IE 11 disables Norton Vulnerability Protection?

I just reset my IE 11 browser to default values.  Now, under "manage add-ons" it shows the "Norton Vulnerability Protection" add-on as disabled.  I have enabled it several times but the browser keeps disabling it.  I chatted with an agent who said not to worry.  The latest Norton updates do not need any help from the browser to function.  So Norton Vulnerability Protection is active even if the browser says it is not.  Is that correct?  How to get the browser to acknowledge it is enabled?