OK, I guess everyone figured I didn't see the "Set Preference" boxes at the top of about:config. I did.
I'm trying to alter the minimum font size, as suggested by coffeedrinker in his post when he said:
To set minimum fonts size:
user_pref("font.min-size.fixed.x-western", 17);
user_pref("font.min-size.variable.x-western", 17);

Neither of those parameters are in my about:config display. If I use the "Set Preferences" boxes to enter them with the value of 17, nothing is added.
I do have two similar parameters:
font.size.fixed.x-western int 12
font.size.variable.x-western int 16
When I attempt to alter these values using the "Set Preference" boxes, nothing is changed.
What am I missing?
Tom