Mozilla 1.0 allows remote attackers to steal cookies from other domains via a javascript: URL with a leading "//" and ending in a newline, which causes the host/path check to fail.
http://www.securityfocus.com/bid/5293
http://www.mozilla.org/releases/mozilla1.0.1/security-fixes-1.0.1.html
http://www.mandrakesoft.com/security/advisories?name=MDKSA-2002:074
http://cert.uni-stuttgart.de/archive/bugtraq/2002/09/msg00230.html