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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?

Yep, Debian. Other map sites work fine for me (caltopo.com, ridewithgps.com).

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.

Works for me with FF 68 on Mac

Works for me (FF on Ubuntu)

Works for me in Firefox 67

worked for me on palemoon