For multisite/network installations only. Adds columns to your network admin to show which sites are using each plugin and theme.
No, the columns are only added in the network admin dashboard. There is no change on the normal site dashboards so there is nothing to see on a single-site installation.
Please update to version 1.2 for improved support for custom database prefixes.
Yes! Just copy the network-plugin-auditor.php file to your mu-plugins folder. Be aware that you will not receive automatic notices of updates if you choose to install the plugin this way.