Issues related to applications and software problems
If you are using an official Mozilla build, then yes. Those still having issues are using the firefox package from the RHEL/CentOS repositories, which is 60.6.1 ESR which is unpatched against the issue.
Using the default Firefox install from CentOS.
Remember - importing/building packages will likely "byte you in the butt" come update time, long after you'd forgotten you did that! Use repos whenever possible.