Oswald Font not loading, error

Font 'Oswald' is missing in Firefox.
In Safari & Chrome it is displayed correctly.
Firebug shows this error message:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://fonts.gstatic.com/s/oswald/v10/HqHm7BVC_nzzTui2lzQTDZBw1xU1rKptJj_0jans920.woff2. (Reason: CORS header 'Access-Control-Allow-Origin' missing).