I decided to stop developling MyBB addons. You can find details here: lukasamd/MyBB-View_Unread_posts#25
This plugin shows users who viewed thread. It adds additional list after "Users browsing this thread".
Admin can simply edit global templates with list and list element. Plugin also allows to enable / disable collection of data and allow list to be viewed by logged-in users only.
New options:
- add option to display last visit time on mouse hover
- add option to sort list by username, UID, GID and visit date
INFO: This plugin adds link to author website (only for web spiders). If you do not want this, do not use plugin, or make donation and contact author.