You can use the Stylish browser extension to add the appropriate style for the text that you want to change. You might have to find someone who understands CSS. There is no built in way to change the font.
It might also work to customize the font settings in your browser, but I haven't tried that.
But I think you might like the results better if you export your GEDCOM file and use the data in another program that can print out what you are after. Family Tree Magazine lists some option.
