Posted by Stefan_Salewski on Mar 13, 2020; 11:37am
URL: https://discuss.asciidoctor.org/Using-Google-Web-Fonts-tp7757p7759.html

Was my own issue, sorry.

I had deselected in Firefox preferences for fonts/advanced

"Allow pages to choose their own fonts, instead of your selections above"

I think I set that some years ago and forget about it.