Show Current Template的作者是JOTAKI Taisuke,目前有90,000+个有效安装。已经Tested with 5.3.3版本的wordpress。
Description
A WordPress plugin which shows the current template file name, the current theme name and included template files’ name in the tool bar. If you like this plugin, you can buy me a coffee!
Inspired by (and big thanks to):

http://gist.github.com/gatespace/4482529
http://wp101.net/plugins/reveal-template/