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Comment by hackuser | Hacker News Reader

I'm glad Firefox is doing this, but ...

> 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.

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StackOverflow, sadly. Their Javascript requires some off site cookies to allow for their cross domain user account stuff. Not enabling third party cookies on the StackExchange sites leads to broken pages.

Wouldn't that be the case for any site using sso?

Yes, though there are some ways around this. You could send the user to another domain to sign in using a unique request ID that identifies the user. After authenticating this unique ID can be communicated back to the first site to show the user has authenticated, and a cookie could keep the session information. That wouldn't give a seemless sign-in on every site, though - you'd need one cookie (and one sign-in) per domain.

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.

My university uses Piazza often as a forum, linked in through our course management site, Canvas. If you don't have 3rd party cookies, it used to just not work, but not it redirects you into opening a new tab/window for Piazza. It's still annoying and would be nice to have it right there in Canvas

I've been blocking 3rd party cookies for years. I think I've seen less than five sites break.

Google.

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

hbogo.com relies on third party cookies from my cable company.

I think I remember allowing them to watch Thursday Night Football on Twitter. I can't find anything about third-party cookies and tnf.twitter.com on Google though.

Quidco.com and similar referral-promotion sites.

The Shopify plugins from Bold use them.

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