When loading webfonts of Amazon's CDN Cloudfront, a problem arises in FF and IE9. The fonts are not rendered! This is because a header is missing and these browsers refuse to render them due to security reasons. The fix is really easy, add these lines to your .htaccess file:
Then the next step is to invalidate the font files that are cached on the CDN (you can do this through the AWS control panel). Wait until CloudFront refreshes the files and voila, it will serve the webfonts with the Access-Control-Allow-Origin header set and FF and IE9 will render them normally!