Mozilla Firefox before 1.0 truncates long filenames in the file download dialog box, which makes it easier for remote attackers to trick users into downloading files with dangerous extensions.
https://exchange.xforce.ibmcloud.com/vulnerabilities/18016
https://bugzilla.mozilla.org/show_bug.cgi?id=234416
http://security.gentoo.org/glsa/glsa-200501-03.xml