How to use zfdebug plugin

From TomatoCMS Documentation

zfDebug is plugin written by Joakim Nygård and it is very great to show useful information in Zend Framework-based website.
If you are not familiar with this, you can find more information on its website
You can use this plugin inside TomatoCMS for debugging more easy.
Below is two steps to use this plugin:
Step 1: Assuming that you are in back-end section, goto System > Plugin menu

Step 2: Look at the zfdebug plugin section from the list of available plugin and click on Install button.
After that, you will get installing success message.

Of course, if you want to uninstall this plugin, just click this button again.
Finally, jump to any page in front-end or back-end section. You will see many useful information provided by this plugin at the bottom of page.