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Comment by gcp | Hacker News Reader

Custom settings for history -> Accept third party cookies (Always/Never/From visited).

in case anyone is wondering.

Chrome, IE, and Safari all have options to disable third party cookies as well. This has been a standard browser option for decades.

No, this is different. Firefox has an option to encapsulate third-party cookies by origin page.

So, depending on if you click on a facebook like button on A.com or B.com, facebook sees two entirely separate browsers.

This really isn't my area of expertise. Can you provide a link to what you're talking about? AFAIK, if you have third-party cookies set to "never", Facebook sees exactly the same (lack of) cookies no matter where I click on a like button outside of Facebook.com itself. So, if Firefox does what you say, I still don't see what it has to do with the third-party cookie option gcp pointed to.

Also, in trying to figure out exactly what feature you're talking about, I've come across quite a lot of sources that suggest that Safari has similar or more strict default settings than Firefox regarding third-party cookies.

It's part of the container tabs concept, but automatically putting each first-level origin (what you see in the URL bar) into its own container. This is atm only an about:config option in Nightly.

So how do you use this with systems that need it - can you log into the site for this "container"? Or would it leave the container when you go to the sign-in page? Like if I'm using Google or Facebook for single-sign-on, or I want to comment on a Disqus thread below a news article - since it's in its own container, I'm not logged in on this other site, but if I click a link to log in and it takes me away from this site, it takes me away from this container.

That's actually an interesting issue I had with it, in some versions that actually didn't work. But, somehow, now it does, and I don't know why (haven't read up on it yet).

TL;DR: Can't tell you how, but it somehow works.

https://support.mozilla.org/en-US/kb/enable-and-disable-cook...

Link with pictures if anyone can't find it.

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