Mozilla Firefox is an open source Web browser. XULRunner provides the XULRuntime environment for Mozilla Firefox.A flaw was found in the processing of malformed web content. A webpage containing malicious content could cause Firefox to crash or,potentially, execute arbitrary code as the user running Firefox.(CVE-2009-1313)For technical details regarding this flaw, refer to the Mozilla securityadvisory for Firefox 3.0.10. You can find a link to the Mozilla advisoriesin the References section of this errata.All Firefox users should upgrade to these updated packages, which containFirefox version 3.0.10, which corrects this issue. After installing theupdate, Firefox must be restarted for the change to take effect.