1. https://www.mozilla.org/ko/ 에서 firefox 다운로드
2. about:config 들어가서
network.trr.uri : https://mozilla.cloudflare-dns.com/dns-query
network.trr.BootstrapAddress : 1.1.1.1
network.trr.mode : 3
network.security.esni.enabled : true
로 설정
3. https://www.cloudflare.com/ssl/encrypted-sni/ 에서 확인. encrypted sni 뜨면 성공
