We don't need to send any information to our service to protect you from bad sites because that is handled locally. The browser history already exists so the load on your machine is the same with or without Apozy. We use the headers to make it efficient for a large number of sites - 1M+
Using the extension without opting in means you don't see site privacy grades but you're still protected using a Trust on First Use model of security created with your browsing history.
Using the extension without opting in means you don't see site privacy grades but you're still protected using a Trust on First Use model of security created with your browsing history.