The remote host is vulnerable to multiple attack vectors.
The installed version of Firefox is affected by a flaw that could lead to a Denial of Service (DoS) condition within the browser. In addition, the version of Firefox is reported vulnerable to a buffer overflow when processing malformed XML documents. An attacker exploiting either of these flaws would need to be able to convince a user to visit a malicious URI.
Upgrade to version 188.8.131.52 or higher.