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Test your applicationsUpgrade Centos:6 firefox to version 0:45.3.0-1.el6_8 or higher.
Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Centos.
See How to fix? for Centos:6 relevant fixed versions and status.
The nsDisplayList::HitTest function in Mozilla Firefox before 48.0 and Firefox ESR 45.x before 45.3 mishandles rendering display transformation, which allows remote attackers to execute arbitrary code via a crafted web site that leverages "type confusion."