Notes for getting MathML fonts working on Debian Firefox
September 6, 2018
This is a simplified, Debian only, version of what worked for me, mostly from http://mcelrath.org/Notes/MathML. See also http://kb.mozillazine.org/Gecko:_FAQs_:_Linux_XFT_and_MathML This is with Debian testing as September 12, 2006
 aptget install latexxftfonts
 install the Mathematica 4.1 ttf fonts into /.fonts (use the unzip utility to unpack).

setenv MOZ_DISABLE_PANGO 1
 visit about:config and set font.mathfontfamilyit to one of
 Math1, Math2, Math4
 CMSY10, CMEX10
This is to get rid of the complaining about the missing symbol font.