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 is this the final rollout? I think I have been reading the same news for years.

@arshubham They've been rolling it out gradually for a long time - I suspect the fear was that this might break enough websites that it would be a problem for the average user.

The article says this is for "all users" now.