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Test your applicationsThere is no fixed version for Centos:7 firefox.
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:7 relevant fixed versions and status.
In libexpat through 2.7.3, a crafted file with an approximate size of 2 MiB can lead to dozens of seconds of processing time.