I've been using a custom font (DejaVu) with unchecked "allow sites to use their own fonts" since a long time. But now some sites came with this new idea of icon fonts that look completely broken (a weird box with crazy stuff inside) until I globally check "allow sites to use their own fonts". Is there any way to configure different fonts per site? Specifically I would like to keep my all time configuration except for these specific sites which should be loading their beloved fonts.

Regards -- Carlos