Good in what sense? Firefox is already blocking third party cookies as part of its enhanced tracking protection (which you should set to "strict" level, go do that right now if you didn't already).
Unfortunately, this kind of change usually forces the rest of the industry to follow. If Chromium is updated to no longer support them, then Edge, Brave, etc. can simply pull those changes in, and Firefox sadly has to follow suit or be left behind. We saw the same shit happen with the CORS changes being pushed by Chrome.
Other browser makers such as Apple, Brave, and Mozilla have already begun blocking third-party cookies by default. Google Chrome and Microsoft Edge provide that option, just not out of the box.
Any CDN worth its salt can run on your domain so that's not an issue. The issue is that no third-party anything is pointless as links will just change from nyt.adnetwork.com to adnetwork.nyt.com. I'd rather not encourage those kinds of DNS shenanigans.
But that is a lot harder to do and requires more resources.
If you have a tracking pixel now, the company directly knows your browser from you downloading that pixel. If they were to implement the single-backend stuff, the site would have to gather all that information themselves and then send it to all the trackers.
But they can't just send it somewhere, because then everyone could send bogus info to them so you need verification and an api and that is costly and each company would build their own api so you need to buy a program that speaks all those apis... You get the point. It's a LOT more work than just pasting the text for some pixel somewhere on your site and let the others do the rest.
With the publication of its notice of intent to deprecate and remove third-party cookies, those involved in the development of Google's Chrome browser and its associated Chromium open source project now have more specific guidance.
As Google senior software engineer Johann Hofmann observed in his aforementioned notice, the phaseout of third-party cookies and shift to Privacy Sandbox technology – in Chrome at least – is a significant change in the status quo.
The impact of replacing the technical foundation of internet advertising while marketers are still doing business on the premises hasn't been lost on regulators, who have been trying to ensure that Google builds a level-playing field – something critical lobbying groups have disputed.
Thus Google has agreed to make specific commitments to the UK's Competition and Markets Authority (CMA) to allay concerns that the Privacy Sandbox doesn't become a killzone for competitors.
While it seems unlikely that watchdogs want to ensure that every marketer operates from an equal level of informational wealth, competitors have a unique opportunity to hamstring the ad giant by raising the alarm amid its antitrust trials and inquiries around the globe.
"The web in general is rapidly moving away from third-party cookies, with Firefox and Safari leading the way," said EFF senior staff technologist Jacob Hoffman-Andrews in an email to The Register.
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