The remote host is running a version of Mozilla Firefox earlier than 3.0.16 or 3.5.6. Such versions are potentially affected by multiple vulnerabilities :
Binary data 5264.prm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3388
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3389
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3979
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3980
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3981
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3982
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3983
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3984
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3985
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3986
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3987
www.mozilla.org/security/announce/2009/mfsa2009-65.html
www.mozilla.org/security/announce/2009/mfsa2009-66.html
www.mozilla.org/security/announce/2009/mfsa2009-67.html
www.mozilla.org/security/announce/2009/mfsa2009-68.html
www.mozilla.org/security/announce/2009/mfsa2009-69.html
www.mozilla.org/security/announce/2009/mfsa2009-70.html
www.mozilla.org/security/announce/2009/mfsa2009-71.html
www.mozilla.org/security/known-vulnerabilities/firefox35.html#firefox3.5.6