It is strongly recommended to read the instructions for MathML fonts before trying to install this add-on.
Mathematical formulas have miscellaneous notations that require specific fonts to be rendered correctly. This add-on contains WOFF2 versions of some free mathematical fonts recommended by the Mozilla MathML Project.
For users that do not already have the required fonts installed on their systems, this add-on will provide a better rendering of mathematical text, including more pleasant style and support for more Unicode symbols. It may also improve stretching of mathematical operators.