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For many years, privacy advocates have been sounding the alarm on the use of cookies to track, profile, and serve personalized ads to web users. The discussion has been especially acute over cookies used for cross-site tracking, in which a website leaks or offers visitor data to third-party services included in the site.
In response, some of the major web browser vendors stepped up their efforts in the past two years to offer improved or new options to block third-party cookies. In 2020, Apple updated Intelligent Tracking Prevention in Safari and, in 2021, Mozilla rolled out Total Cookie Protection in Firefox to clamp down on tracking via third-party cookies.