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The fonts are stored on the docs.webplatform.org domain, and Firefox won't serve them to other subdomains, like webplatform.org or talk.webplatform.org. To fix this, we need to enable CORS on the server: http://blog.yjl.im/2010/05/font-face-and-cross-domain-cross-origin.html
I've pushed out a change that should fix this. Please close the bug if it's working.
*** Bug 19249 has been marked as a duplicate of this bug. ***