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

For more information:
SA33799

Solution
Apply updated packages via the yum utility ("yum update xulrunner").
Original Advisory
FEDORA-2009-1399:
https://www.redhat.com/archives/fedora-package-announce/2009-February/msg00240.html

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers