See the referenced Mozilla bug for details.
Should be fixed by the pending rebase https://bugzilla.redhat.com/show_bug.cgi?id=1386874
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2017:2100
This is _not_ fixed in RHEL 7.4 and I cannot reopen this bug report.
A year later and this bug report is still not solved.
Is it the same issue?