Firefox fonts

[Michael Hennebry]

I recently installed some courier fonts.
I cannot tell which, if any, of them Firefox is using.
They are in the font chooser.

How do I discover what font Firefox actually uses for something?
I've found Inspect Element, but I'm pretty sure Firefox is substituting.
How do I discover what was substituted?

Is there a way to control what Firefox uses for substitution?

I'm running CentOS 6.

-- 
Michael   hennebry at web.cs.ndsu.NoDak.edu
"SCSI is NOT magic. There are *fundamental technical
reasons* why it is necessary to sacrifice a young
goat to your SCSI chain now and then."   --   John Woods