vector-maps not working in firefox

[Wolfgang Zenker]

Hi,

not sure if this is a problem of firefox or one of the components used.
Vector-based maps display wrong in Firefox on FreeBSD (all of the
Firefox versions that I have tested in the last year at least, on
FreeBSD 10.x and 11.x). The same maps work fine in Firefox on Linux
and in Chromium on FreeBSD.
How would one identify the software that is actually at fault here?
Or maybe its just a problem on my FreeBSD installations?

A few example URLs:
https://www.qwant.com/maps/#map=14.80/46.4354087/-109.8376529
https://www.google.com/maps/@46.435512,-109.8343499,15z
https://duckduckgo.com/?q=harlowton+mt&atb=v128-4__&ia=web&iax=about&iaxm=about

Wolfgang