For some historical reasons, the firefox package suggests fonts-lyx which contains "TeX's Computer Modern Fonts" that were needed for the MathML support of Gecko 1.8 (https://developer.mozilla.org/en-US/docs/Mozilla/MathML_Project/FontsMozilla1.8). Support for these fonts has been removed for a very long time and it is now recommended to use modern OpenType MATH fonts instead (https://developer.mozilla.org/en-US/docs/Mozilla/MathML_Project/Fonts). Hence the firefox package should instead suggest the following math fonts:
* Latin Modern = "computer modern" style used by default in LaTeXn compatible with the old true type fonts.
* STIX fonts (fonts-stix) = fonts created by a consortium of scientific orgs, with large unicode coverage for math symbols.
(Note that Debian already suggests STIX and I opened https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=792012)
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