The remote host is running a version of Mozilla Firefox earlier than 3.0.19. Such versions are potentially affected by multiple security issues :
Binary data 5493.prm
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0173
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0174
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0175
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0176
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0177
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0178
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0179
www.mozilla.org/security/announce/2010/mfsa2010-16.html
www.mozilla.org/security/announce/2010/mfsa2010-17.html
www.mozilla.org/security/announce/2010/mfsa2010-18.html
www.mozilla.org/security/announce/2010/mfsa2010-19.html
www.mozilla.org/security/announce/2010/mfsa2010-20.html
www.mozilla.org/security/announce/2010/mfsa2010-21.html
www.mozilla.org/security/known-vulnerabilities/firefox36.html#firefox3.0.19