DNSSEC Validator is a web browser add-on developed by CZ.NIC Labs. It allows users to check the existence and validity of DNS Security Extensions (DNSSEC) records related to domain names in the address of the webpage currently displayed in the browser window.

With DNSSEC Validator, users can easily determine the DNSSEC status of a website. The add-on displays the result of the check using color keys and information texts in the page's address bar. This provides users with a quick and convenient way to verify the security of the websites they visit.

DNSSEC Validator is available for Chrome on various platforms including Windows 32-bit, Linux x86/x86_64, and Mac OS X x86/x86_64. It is a free add-on and can be installed directly from the Web Store repository.