It depends where the firewall is initialized - somewhere in /etc/rc.d - I'm not too familiar with FC startup scripts. You could grep for it.
To boot in single user mode, if you're using lilo then press 'Ctrl-X' at the splash screen and add "linux single" to the prompt. If you're using grup then you press 'e' to edit the boot parameters, add "single" to the end of the line with your kernel, then "Enter" and 'b' to boot.
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