Firefox rolls out Total Cookie Protection by default https://blog.mozilla.org/en/mozilla/firefox-rolls-out-total-cookie-protection-by-default-to-all-users-worldwide/ It creates a separate “cookie jar” for each website you visit. Instead of allowing trackers to link up your behavior on multiple sites, they just get to see behavior on individual sites.
Firefox Rolls Out Total Cookie Protection By Default | The Mozilla Blog

Updated Aug. 28, 2024. Take back your privacy Firefox is rolling out Total Cookie Protection by default to more Firefox users worldwide, making Firefox the

@jgbarah the cookie values are still supplied by the remote sites, how does this stop them from correlating and tracking individuals anyway?
@gws
In general, they cannot, because cookies in different "jars" seem to correspond to different browsers