Firefox

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Firefox rolls out Total Cookie Protection by default to all desktop users worldwide | It is Firefox’s strongest privacy protection to date, confining cookies to the site where they were created (blog.mozilla.org)

submitted 3 weeks ago by [email protected] to c/[email protected]

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[–] [email protected] 26 points 3 weeks ago (1 children)

It is already a thing for 2 years, since this is just an update to an old blog post to say that they'll do even more now.

Aside from that, it wasn't a thing, because as per the usual something on the web breaks when you change behavior like that, because some webpages rely on third-party cookies to provide their core functionality.

Someone (in this case the Tor Browser devs) had to come up with a way to have third-party cookies ~~and eat them, too~~ but isolate them from the third-party cookies that got created on other webpages.
On the technical side, this is called "first-party isolation", and basically each domain you browse to gets its own cookie jar to store first- and third-party cookies in.

[–] [email protected] 2 points 3 weeks ago

Cookie jar... I will use that term from now on