Centos Desktop / Firefox, where is the firefox setting stored for this ( that is editable via text editor )

Centos Desktop / Firefox, where is the firefox setting stored for this (
that is editable via text editor )

In Centos Linux Desktop, if you
1: Open Firefox.
2: Go to...
Preferences ----> Content --- > Colors
Uncheck all those checked boxes and then select something like
Red
for the background
and
Green
for the Text..
and click on
OK
where in linux is this setting stored so i can perhaps modify it via
terminal ?