The talk given at the FOSDEM conference in 2023 is about over a decade of anti-tracking work at Mozilla. The speaker, Vincent Turu, discusses the various ways tracking can be harmful and the risks it poses. He then explains the steps Mozilla has taken to minimize the harmful effects of tracking, focusing on cookies, IP addresses, email addresses, and phone numbers. The talk highlights Mozilla's commitment to user privacy and their ongoing efforts to develop tools and technologies that protect user data.