> allow cookies to be shared between secure sites using the same certificate In some ways that will be less strict than Firefox's implementation. A CDN might h

> allow cookies to be shared between secure sites using the same certificate In some ways that will be less strict than Firefox's implementation. A CDN might have a certificate with hundreds of unrelated sites in it. In some ways that will be more strict than Firefox's implementation. A site might want to serve large static files on static.foo.com but a secure login page on login.foo.com , and want to hand over the private key for static.foo.com to a CDN but not hand over the private key for login.foo.com .