--- a/security/manager/ssl/nsNSSCallbacks.cpp
+++ b/security/manager/ssl/nsNSSCallbacks.cpp
@@ -1059,16 +1059,18 @@ AccumulateCipherSuite(Telemetry::ID prob
     case TLS_RSA_WITH_CAMELLIA_128_CBC_SHA: value = 62; break;
     case TLS_RSA_WITH_AES_256_CBC_SHA: value = 63; break;
     case TLS_RSA_WITH_CAMELLIA_256_CBC_SHA: value = 64; break;
     case SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA: value = 65; break;
     case TLS_RSA_WITH_3DES_EDE_CBC_SHA: value = 66; break;
     case TLS_RSA_WITH_SEED_CBC_SHA: value = 67; break;
     case TLS_RSA_WITH_RC4_128_SHA: value = 68; break;
     case TLS_RSA_WITH_RC4_128_MD5: value = 69; break;
+    // TLS 1.3 PSK resumption
+    case TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256: value = 70; break;
     // unknown
     default:
       value = 0;
       break;
   }
   MOZ_ASSERT(value != 0);
   Telemetry::Accumulate(probe, value);
 }

--- a/security/manager/ssl/nsNSSComponent.cpp
+++ b/security/manager/ssl/nsNSSComponent.cpp
@@ -1091,16 +1091,19 @@ static const CipherPref sCipherPrefs[] =
    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, true },
 
  { "security.ssl3.dhe_rsa_aes_128_sha",
    TLS_DHE_RSA_WITH_AES_128_CBC_SHA, true },
 
  { "security.ssl3.dhe_rsa_aes_256_sha",
    TLS_DHE_RSA_WITH_AES_256_CBC_SHA, true },
 
+ { "security.ssl3.ecdhe_psk_aes_128_gcm_sha256",
+   TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256, true },
+
  { "security.ssl3.ecdhe_rsa_rc4_128_sha",
    TLS_ECDHE_RSA_WITH_RC4_128_SHA, true, true }, // deprecated (RC4)
  { "security.ssl3.ecdhe_ecdsa_rc4_128_sha",
    TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, true, true }, // deprecated (RC4)
 
  { "security.ssl3.rsa_aes_128_sha",
    TLS_RSA_WITH_AES_128_CBC_SHA, true }, // deprecated (RSA key exchange)
  { "security.ssl3.rsa_aes_256_sha",