Another option, for those sites which rely on third-party cookies to work (they're rare, but they do exist; so far, I've only found one), would be to scope the

Another option, for those sites which rely on third-party cookies to work (they're rare, but they do exist; so far, I've only found one), would be to scope the third-party cookies. That is, if both foo.com and bar.com do a request to thirdparty.com, each would have their own set of cookies for thirdparty.com, and both would be different from the cookies used when thirdparty.com is accessed directly.