This plugin allows an admin user to login in as any user with just the admin password.
Compatible only with Joomla 3.9.4. Not compatible with Joomla 4. A new version will be released only after the release version of Joomla 4 is published.
This plugin, by design, reduces the security of your system drastically. You have been warned!
Configuration is easy, just enable the plugin in menu
Extensions -> Plugin Manager and enter an admin user name in the plugin settings section. It could be any user, but for obvious reason you should only enter your admin user. Now that admin user should be able to login in as any user by entering the user name (not the admin user name) and the admin password.
Warning! The admin password should be very strong (at least 32 characters recommended). Do not forget to disable if not needed.
Please don't forget to backup and test in a sandbox system first :-)