Fedora has issued an update for firefox. This fixes some vulnerabilities, which can be exploited by malicious people to conduct cross-site scripting and spoofing attacks, bypass certain security restrictions, disclose sensitive information, or potentially compromise a user's system.

For more information:
SA30911

Solution
Apply updated packages via the yum utility ("yum update firefox").
Original Advisory
https://www.redhat.com/archives/fedora-package-announce/2008-July/msg00207.html

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers