I'm using that exact combo, Fedora 23, Firefox 45 and Gnome 3. Basically vanilla Fedora 23. I have no issues. Given how common that font is and how well visite

I'm using that exact combo, Fedora 23, Firefox 45 and Gnome 3. Basically vanilla Fedora 23. I have no issues. Given how common that font is and how well visited that page is I think it's pretty obvious your system is broken.