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don't log into a server as root. don't run X applications as root, especially not something like a web browser, when there is no benefit ever from doing so.
For the lack of a DISPLAY setting, in my experience that tends to relate to not having the Xauthority set up correctly, and generally from not having xauth and associated libraries installed on the remote system. On CentOS / RedHat etc, this is the xorg-x11-xauth package.
I just checked the option in my SSH client Tunnel X11 Connections and restarted the SSH client. Now it shown the following message:
/usr/bin/xauth: creating new authority file /root/.Xauthority
X connection to localhost:10.0 broken (explicit kill or server shutdown).
The application 'firefox' lost its connection to the display localhost:10.0;
most likely the X server was shut down or you killed/destroyed
this link should help setting up your X11 Forwarding. also as has been mentioned please do not log into your server running root. just ssh -X user@IP that will be plenty powerful enough to run firefox remote.
you can always use xeyes to test your X11 forwarding too. once your ssh -X is connected (AS USER) you can type xeyes and you should get a pair of eyes on your local desktop that will follow your mouse around the screen.
If that works, then your X11 Forwarding is working.