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If I disable this feature, will ads target me with the old cookie methods?

Yep, and else with browser fingerprinting; https://amiunique.org/fingerprint says that even with adblock and some tracking measures turned off, my browser fingerprint is still unique among 2054475 others.

Chrome are limiting fingerprinting too, including reducing the User-Agent header. https://developer.chrome.com/en/docs/privacy-sandbox/user-ag...

Yes. They will also do so if you keep the feature on. Third-party cookies in Chrome won't be blocked for the near-term future at least.

Unless you switch browsers - e.g. Firefox has blocked third-party cookies for a while now.

There's an option in the settings to block third-party cookies. Does that no do what it says?

Yes. You can also disable the new Google topics system.

Is that the `chrome://settings/adPrivacy` thing that I've seen in another comment? Is that Chrome-only?

On Chromium 117.0.5938.48, it sends me to the settings home page.

It does, it's just not on by default yet. You can turn it on now if you want to get ahead of the curve.

Chrome is scheduled to drop third-party cookies mid-2024.

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