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See here in the uBlock Origin wiki: https://github.com/gorhill/uBlock/wiki/Dashboard:-Settings#u...

Which in turn, links to this for background information https://www.theregister.com/2021/02/24/dns_cname_tracking/

Oh wow, this is more than a performance problem, this is a mitigation for a data security problem that only got introduced because trackers try to work around per-domain cookie isolation.

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