Comment 54 for bug 44062

(In reply to comment #53)
> I know nothing about programming, but why don't you just make it block anything
> starting with a period. No domain names have periods at the end of it.

Because setting a cookie on ".example.org" makes it available to
"www.example.org", "example.org", and "sub1.example.org". This is invaluable to
dynamic sites which make usage of subdomains.

The problem is simply that Mozilla currently doesn't see the difference between
".example.org" and ".co.uk" (which is reasonable, but definitely a problem...)

-[Unknown]