> Blocking third-party cookies can break some site that rely on third-party resources

Can anyone name sites that require them?

As someone who defaults to deny all cookies and manually enables every one my browser accepts, I don't think I've found a site that requires 3rd-party cookies. Few sites require cookies unless you login or have shopping cart.

Of course, that's anecdotal. Maybe I just don't visit certain categories of sites and don't encounter them.

The other way is to have all StackExchange sites be subdomains of stackexchange.com - which is how the designers of the web intended it to be, I think.

The entire notification center, cross-site hangouts chat, etc all requires third-party cookies.

For anyone else interested: now that I know what to search for, I also found some status at https://wiki.mozilla.org/Security/FirstPartyIsolation

I'm not sure this description is as clear as you intended.

... so evilcorp.org cookies for evilcorp.org images on A.org will not be set for evilcorp.org images on B.org.

note how every single privacy feature came after google-money. during google-money what did we got? third party cookies accepted as default.

good riddance, google.

I remember, as a volunteer, debating some privacy issue with a Google dev in Bugzilla. They made some crack about looking a gift horse in the mouth, but the discussion was out in the open. I don't recall evidence that Google was influencing Firefox improperly, but OTOH absence of evidence is not evidence of absence ...

You're the one who accuses Mozilla and Google, of different things, sure, but fairly important things anyway.

The burden of proof lies with you. Not us. It is not up to us to "find the pattern."

Not that I disagree with you on the fact that Mozilla seems much better off, post-Google.

* Note that "withdrew" might also mean "offered less money than before because Firefox had less users than before, and Yahoo! offering more.