tried it via tor

Doesn’t load in Tor for me either but I suspect their site is simply blocking Tor. The site does load fine outside Tor in the regular clearnet.

9 times out of 10 these sort of things turn out to be a DNS issue on your end, you might want to double-check you’re actually able to query their IP address via nslookup freedns.afraid.org or similar. (assuming you’ve already tried other web browsers to rule out issues with installed extensions or specific browser settings).