This is the best summary I could come up with:

For the past 30 years, websites and tech companies have used so-called “third-party cookies” as the primary way to track consumers online.

But most people don’t bother to change browsers, and if nothing else, Google’s shiny new version of Chrome is a step forward for privacy because it reveals less information about you and what you’ve been up to on the internet.

“We are making one of the largest changes to how the Internet works at a time when people, more than ever, are relying on the free services and content that the web offers,” said Victor Wong, Google’s senior director of product management for Privacy Sandbox, told Gizmodo in an interview in April, 2023.

These moves are a big deal because the vast majority of internet users are on Chrome, which means when Google is done with its cookie killing, they’ll essentially be dead for good.

If you see a popup in Chrome on January 4th, that means you’re in the test group of 1% of users who are getting “Tracking Protection” by default, which is Google’s name for the cookie-blocking tool.

Google is working to single out the bad cookies and save the good ones, but some things will inevitably break in the early stages.

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