Below are screenshots of the demo page with different fonts in Firefox 31 for Linux. This is simply achieved by using the classical CSS rule font-family with optional @font-face rules to define a fallback with Web fonts. Gecko 31 is required to get the different fonts used for the drawing of operators (e.g. the integral and sum symbols). Other features of the OpenType MATH table (e.g. gaps or linethickness) are not implemented yet in this version.