Univention blog issue with Firefox

Univention blog does not display properly in Firefox but Ok in Chrome & Edge.

Tested with the following versions:
Mozilla Firefox v.78.0.2 (64-bit)
Google Chrome 84.0.4147.89 (Official Build) (64-bit)
Microsoft Edge 84.0.522.40 (Official Build) (64-bit)

I use the same Firefox version and cannot find any issue. In German as well as in English.

EFF’s Privacy Badger extension detected two Univention sites as potential trackers and blocked 3 CSS and 3 JavaScript files as shown below:


I can see that one of the blocked sites (https://www.piwik.univention.de/) is an analytics platform for Univention. Could you honor the slogan on that page ( be open ) and let me know what kind of data is Univention trying to collect from my connection?