If web developers aren't going to bother with cross-browser compatibility it'd be nice if they at least went back to telling visitors which browsers they do support.
Me too. It likes FF 67.0 64 bit on win but dislikes FF 67.0 on 64 bit FreeBSD. The mapbox URLs aren't called on the latter. Are you also on a unix-like system?
Yup same here, other mapping sites are just fine. Do you have a User-Agent masquerader add on available? I have no connectivity to my freebsd box at home now (no, thank you Frontier) or I'd try it and report back. But for the browser dependency it's a good looking site.