`network.dns.blockDotOnion:false` doesn't work.
I've setup Tor as a proxy on my machine.
Chromium can connect to Onion sites without any problem.
Firefox can't access Onion sites, even with `network.dns.blockDotOnion` set to `false`.
Additional System Details
- User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0