This add-on is designed to show all members who replied to threads and viewed them by making the thread replies and views clickable on thread list and on thread view.
View contributors and viewers for own threads:
View contributors and viewers for all threads:
Those permissions control who will be able to view thread contributors and viewers list. The first permissions can be found under the Forum Permissions section and the second permission can be found under the Forum Moderator Permissions section.
To disable viewing of repliers and readers of threads in nodes, when editing the permissions of said node for groups that you do not want to view thread repliers and readers, revoke the permissions.