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From Chrome 118, the DevTools Issues tab shows the breaking change issue, "Cookie sent in cross-site context will
be blocked in future Chrome versions." The issue lists potentially affected cookies for the current page.

Privacy Sandbox Analysis Tool (PSAT)

We have also built the Privacy Sandbox Analysis Tool (PSAT), a DevTools extension to facilitate analysis of cookie
usage during browsing sessions. This provides debugging pathways for cookies and Privacy Sandbox features, with
access points to learn more about the Privacy Sandbox initiative.

The extension complements DevTools with specialized capabilities for analysing and debugging scenarios related to
the deprecation of third-party cookies and adoption of new privacy-preserving alternatives.

You can download the extension from the Chrome Web Store or access the PSAT repository and wiki.

Check your third-parties using cookies

If you identify cookies set by third parties, you should check with those providers to see if they have plans for the
third-party cookie phase out. For instance, you may need to upgrade a version of a library you are using, change a
configuration option in the service, or take no action if the third party is handling the necessary changes themselves.

2. Test for breakage

You can launch Chrome using the --test-third-party-cookie-phaseout command-line flag or from Chrome 118, ena-
ble chrome://flags/#test-third-party-cookie-phaseout. This will set Chrome to block third-party cookies and ensure
that new functionality and mitigations are active in order to best simulate the state after the phase out.