It looks like a cool add-on, but is not compatible with XF 2.3.  They changed how add-ons work, so anything meant for XF 2.2, won't work with the new version. :(

Here's one more to add to the three I mentioned:

[URL unfurl="true"]https://xenforo.com/community/resources/cv6-node-icons-tools.5565/[/URL]

All my other ones are either paid and tied to my license, or are not compatible with the new version of XF....