Norton, McAfee, Kaspersky, and Avast often install "Web Shield" or "Privacy Cleaner" modules that inject code into your browser to block cookies outside of the browser settings.
Unblocking cookies is often the quickest fix for a broken login button or a disappearing shopping cart. While privacy is important, allowing cookies (at least on trusted sites) ensures the internet works the way it was designed to: smoothly and personalized for you. how do you unblock cookies