First Party Sets 'harmful to the web in its current form' Tim Anderson Thu 8 Apr 2021 // 18:15 UTC Share Copy A Google proposal which enables a web browser to treat a group of domains as one for privacy and security reasons has been opposed by the W3C Technical Architecture Group (TAG). Google's First Party Sets (FPS) relates to the way web browsers determine whether a cookie or other resource comes from the same site to which the user has navigated or from another site. The browser is likely to treat these differently, an obvious example being the plan to block third-party cookies.