Is the site for proof of concept working?

[qeerl]

https://privacycheck.sec.lrz.de/passive/fp_etag/fp_etag.php

With different browsers, cache enabled, and some of them with extensions disabled or no extension at all I always get after a page refresh:

Website visits: 0
Your last visit: same as the time the page was refreshed
Your random ETag: different each time, except for a few first numbers