Cross-domain @font-face support in Firefox.

Запускаем bem server и приложение на разных доменах. В Firefox не отображаются подгружаемые шрифты. Сабж это фиксит:
 
Firefox (which supports @font-face from v3.5) does not allow cross-domain fonts
by default. This means the font must be served up from the same domain (and
sub-domain) unless you can add an “Access-Control-Allow-Origin” header to the
font.

See https://developer.mozilla.org/ru/docs/HTTP/Access_control_CORS