Firefox doesn’t allow cross-domain fonts and it is breaking the web.
"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." - Geoff Evason
Link to the bug: https://bugzilla.mozilla.org/show_bug.cgi?id=604421
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