CVE 2011-0071
Directory traversal vulnerability in Mozilla Firefox before 3.5.19 and 3.6.x before 3.6.17, Thunderbird before 3.1.10, and SeaMonkey before 2.0.14 on Windows allows remote attackers to determine the existence of arbitrary files, and possibly load resources, via vectors involving a resource: URL.
See the 
CVE page on Mitre.org
for more details.
