|HTTP response smuggling vulnerability in Mozilla Firefox and
Thunderbird before 18.104.22.168, when used with certain proxy servers,
allows remote attackers to cause Firefox to interpret certain
responses as if they were responses from two different sites via (1)
invalid HTTP response headers with spaces between the header name and
the colon, which might not be ignored in some cases, or (2) HTTP 1.1
headers through an HTTP 1.0 proxy, which are ignored by the proxy but
processed by the client.