TeX Gyre Termes Math Font Package от Krasnaya Ploshchad

This add-on will bring TeX Gyre Termes Math font to provide a better rendering of mathematical text, including more pleasant style and support for more Unicode symbols, also could improve stretching of mathematical operators, without requiring fonts installed on the system.

For more details for fonts for Mozilla's MathML engine, see the documentation on MDN Web Docs.

The TeX Gyre Termes Math font is licensed under the GUST font license.