Build ID in UA string is now frozen at 20100101

Published: | Categories: DOM, Networking, Privacy & Security


The Firefox build identifier, that can be retrieved via the HTTP User-Agent request header as well as the navigator.userAgent and navigator.productSub DOM properties, has been frozen at 20100101 in order to reduce the browser’s fingerprintability. While navigator.buildID still returns the accurate build identifier, this property is considered to be removed in the future.