fonts not loading only in firefox

Hi! Something was saved down badly in your backend, because I can see in our css file, that at the font family the code is wrong, it looks like this:
font-family: font-family: ;

So you should go to the Theme: Default – Configure, and go inside the fonts. Then if you used Google fonts, make sure, that you have all ) and ; signs, as they are in the example:
google(@import url(http://fonts.googleapis.com/css?family=Montserrat);)

if you use font face, then you should just write the name of your custom font there without anything special.
CSS:

@font-face{
     font-family: ExampleFont;
     src: url('http://www.example.com/font/myfont.otf');
}

In our backend:
ExampleFont

But maybe you just haven’t gave any font somewhere, that is why it looks empty in your css file.