Look, I get that #TorBrowser is trying to be more user friendly when presenting errors, but I'm sorry: this message reeks of those creepy #CloudFlare "YO THIS SITE CAN'T BE REACHED BUT HEY, IT AIN'T OUR FAULT ALRIGHT???" error pages.
It made my skin crawl from thinking a certain site became cloudflared until I realized this was a local error message in my browser.