Paragrams and Firefox

it has to be theme related as I am using twenty ten child theme and do not have problem with any browser

Try switching to twenty ten theme see if you have the same problem

Nope. Do not have the problem in twenty-ten.

Is there anything to troubleshoot?

then your theme style.css is the file that has lay outs

this stuff is all new to me, is there documentation?

You have learn css good place learn is here
https://www.w3schools.com/css/default.asp

Look for a theme in repository that will not have the problem try 2010 weaver has lots design templates.

Firefox can show the theme but you have to have the correct zoom setting.