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Firefox Blocks 0.0.0.0 IP Addresses: Tell Us What This Means To You!
(connect.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Try the Firefox Developer version. No addons.
EDIT: Thanks for the suggestions. While I was investigating I ended up looking and had a proxy issue. Obviously a problem on my part.
That would kill development, because accessing http services locally is something pretty much only developers do. What is the error message?
Unable to connect
Firefox can’t establish a connection to the server at 192.168.2.210.
I don't see an error in the log about the specific page I am trying to access, but another had a link to https://support.mozilla.org/en-US/kb/https-only-prefs?utm_source=mozilla&utm_medium=firefox-console-errors&utm_campaign=default&as=u
And of course adding an exception or turning it off doesn't work either.
Perhaps a bug then? AFAIK, "developer edition" is basically just nightly.