Troubleshoot CDN errors

If using a CDN, users could experience problems with Discourse icons under Firefox. To fix this error, uncomment these lines in the /opt/bitnami/apache/conf/vhosts/discourse-vhost.conf and /opt/bitnami/apache/conf/vhosts/discourse-https-vhost.conf Apache configuration files for Discourse:

<FilesMatch "\.(ttf|otf|eot|woff|font.css)$">
    <IfModule mod_headers.c>
        Header set Access-Control-Allow-Origin "*"
    </IfModule>
</FilesMatch>