DNSSEC is a Firefox add-on designed to enhance online security by indicating whether the domains visited are signed with DNSSEC. This tool is particularly useful for privacy-conscious users, as it provides real-time feedback directly in the URL bar. By leveraging DNSSEC, users can ensure that their internet traffic is protected against certain types of attacks, promoting a safer browsing experience.

The add-on operates using Cloudflare'sor Google Public DNS for DNS queries, which means that browsing history is transmitted to these services. Future updates are expected to allow users to implement custom DNS over HTTPS services, offering greater flexibility and privacy. Overall, DNSSEC serves as a valuable addition for those interested in bolstering their online security.