diff -pu a/nss/lib/ssl/ssl3con.c b/nss/lib/ssl/ssl3con.c
--- a/nss/lib/ssl/ssl3con.c	2014-01-17 18:11:28.314468184 -0800
+++ b/nss/lib/ssl/ssl3con.c	2014-01-17 18:23:17.946207727 -0800
@@ -6682,10 +6682,22 @@ ssl3_HandleServerHello(sslSocket *ss, SS
     sid->u.ssl3.sessionIDLength = sidBytes.len;
     PORT_Memcpy(sid->u.ssl3.sessionID, sidBytes.data, sidBytes.len);
 
+    /* Copy Signed Certificate Timestamps, if any. */
+    if (ss->xtnData.signedCertTimestamps.data) {
+	rv = SECITEM_CopyItem(NULL, &sid->u.ssl3.signedCertTimestamps,
+			      &ss->xtnData.signedCertTimestamps);
+	if (rv != SECSuccess)
+	    goto loser;
+    }
+
     ss->ssl3.hs.isResuming = PR_FALSE;
     ss->ssl3.hs.ws         = wait_server_cert;
 
 winner:
+    /* Clean up the temporary pointer to the handshake buffer. */
+    ss->xtnData.signedCertTimestamps.data = NULL;
+    ss->xtnData.signedCertTimestamps.len = 0;
+
     /* If we will need a ChannelID key then we make the callback now. This
      * allows the handshake to be restarted cleanly if the callback returns
      * SECWouldBlock. */
@@ -6711,6 +6723,9 @@ alert_loser:
     (void)SSL3_SendAlert(ss, alert_fatal, desc);
 
 loser:
+    /* Clean up the temporary pointer to the handshake buffer. */
+    ss->xtnData.signedCertTimestamps.data = NULL;
+    ss->xtnData.signedCertTimestamps.len = 0;
     errCode = ssl_MapLowLevelError(errCode);
     return SECFailure;
 }
diff -pu a/nss/lib/ssl/ssl3ext.c b/nss/lib/ssl/ssl3ext.c
--- a/nss/lib/ssl/ssl3ext.c	2014-01-17 18:22:54.945827814 -0800
+++ b/nss/lib/ssl/ssl3ext.c	2014-01-17 18:35:21.798168722 -0800
@@ -81,6 +81,12 @@ static PRInt32 ssl3_ClientSendSigAlgsXtn
                                          PRUint32 maxBytes);
 static SECStatus ssl3_ServerHandleSigAlgsXtn(sslSocket *ss, PRUint16 ex_type,
                                              SECItem *data);
+static PRInt32 ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss,
+						     PRBool append,
+						     PRUint32 maxBytes);
+static SECStatus ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss,
+							 PRUint16 ex_type,
+							 SECItem *data);
 
 /*
  * Write bytes.  Using this function means the SECItem structure
@@ -259,6 +265,8 @@ static const ssl3HelloExtensionHandler s
     { ssl_use_srtp_xtn,           &ssl3_HandleUseSRTPXtn },
     { ssl_channel_id_xtn,         &ssl3_ClientHandleChannelIDXtn },
     { ssl_cert_status_xtn,        &ssl3_ClientHandleStatusRequestXtn },
+    { ssl_signed_certificate_timestamp_xtn,
+      &ssl3_ClientHandleSignedCertTimestampXtn },
     { -1, NULL }
 };
 
@@ -287,7 +295,9 @@ ssl3HelloExtensionSender clientHelloSend
     { ssl_use_srtp_xtn,           &ssl3_SendUseSRTPXtn },
     { ssl_channel_id_xtn,         &ssl3_ClientSendChannelIDXtn },
     { ssl_cert_status_xtn,        &ssl3_ClientSendStatusRequestXtn },
-    { ssl_signature_algorithms_xtn, &ssl3_ClientSendSigAlgsXtn }
+    { ssl_signature_algorithms_xtn, &ssl3_ClientSendSigAlgsXtn },
+    { ssl_signed_certificate_timestamp_xtn,
+      &ssl3_ClientSendSignedCertTimestampXtn }
     /* any extra entries will appear as { 0, NULL }    */
 };
 
@@ -2379,3 +2389,65 @@ ssl3_AppendPaddingExtension(sslSocket *s
 
     return extensionLen;
 }
+
+/* ssl3_ClientSendSignedCertTimestampXtn sends the signed_certificate_timestamp
+ * extension for TLS ClientHellos. */
+static PRInt32
+ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss, PRBool append,
+				      PRUint32 maxBytes)
+{
+    PRInt32 extension_length = 2 /* extension_type */ +
+	    2 /* length(extension_data) */;
+
+    /* Only send the extension if processing is enabled. */
+    if (!ss->opt.enableSignedCertTimestamps)
+	return 0;
+
+    if (append && maxBytes >= extension_length) {
+	SECStatus rv;
+	/* extension_type */
+	rv = ssl3_AppendHandshakeNumber(ss,
+					ssl_signed_certificate_timestamp_xtn,
+					2);
+	if (rv != SECSuccess)
+	    goto loser;
+	/* zero length */
+	rv = ssl3_AppendHandshakeNumber(ss, 0, 2);
+	if (rv != SECSuccess)
+	    goto loser;
+	ss->xtnData.advertised[ss->xtnData.numAdvertised++] =
+		ssl_signed_certificate_timestamp_xtn;
+    } else if (maxBytes < extension_length) {
+	PORT_Assert(0);
+	return 0;
+    }
+
+    return extension_length;
+loser:
+    return -1;
+}
+
+static SECStatus
+ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss, PRUint16 ex_type,
+					SECItem *data)
+{
+    /* We do not yet know whether we'll be resuming a session or creating
+     * a new one, so we keep a pointer to the data in the TLSExtensionData
+     * structure. This pointer is only valid in the scope of
+     * ssl3_HandleServerHello, and, if not resuming a session, the data is
+     * copied once a new session structure has been set up.
+     * All parsing is currently left to the application and we accept
+     * everything, including empty data.
+     */
+    SECItem *scts = &ss->xtnData.signedCertTimestamps;
+    PORT_Assert(!scts->data && !scts->len);
+
+    if (!data->len) {
+	/* Empty extension data: RFC 6962 mandates non-empty contents. */
+	return SECFailure;
+    }
+    *scts = *data;
+    /* Keep track of negotiated extensions. */
+    ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type;
+    return SECSuccess;
+}
diff -pu a/nss/lib/ssl/ssl.h b/nss/lib/ssl/ssl.h
--- a/nss/lib/ssl/ssl.h	2014-01-17 18:00:11.213237373 -0800
+++ b/nss/lib/ssl/ssl.h	2014-01-17 18:38:15.791045050 -0800
@@ -181,6 +181,9 @@ SSL_IMPORT PRFileDesc *DTLS_ImportFD(PRF
  */
 #define SSL_ENABLE_ALPN 26
 
+/* Request Signed Certificate Timestamps via TLS extension (client) */
+#define SSL_ENABLE_SIGNED_CERT_TIMESTAMPS 27
+
 #ifdef SSL_DEPRECATED_FUNCTION 
 /* Old deprecated function names */
 SSL_IMPORT SECStatus SSL_Enable(PRFileDesc *fd, int option, PRBool on);
@@ -483,6 +486,23 @@ SSL_IMPORT CERTCertList *SSL_PeerCertifi
  */
 SSL_IMPORT const SECItemArray * SSL_PeerStapledOCSPResponses(PRFileDesc *fd);
 
+/* SSL_PeerSignedCertTimestamps returns the signed_certificate_timestamp
+ * extension data provided by the TLS server. The return value is a pointer
+ * to an internal SECItem that contains the returned response (as a serialized
+ * SignedCertificateTimestampList, see RFC 6962). The returned pointer is only
+ * valid until the callback function that calls SSL_PeerSignedCertTimestamps
+ * (e.g. the authenticate certificate hook, or the handshake callback) returns.
+ *
+ * If no Signed Certificate Timestamps were given by the server then the result
+ * will be empty. If there was an error, then the result will be NULL.
+ *
+ * You must set the SSL_ENABLE_SIGNED_CERT_TIMESTAMPS option to indicate support
+ * for Signed Certificate Timestamps to a server.
+ *
+ * libssl does not do any parsing or validation of the response itself.
+ */
+SSL_IMPORT const SECItem * SSL_PeerSignedCertTimestamps(PRFileDesc *fd);
+
 /* SSL_SetStapledOCSPResponses stores an array of one or multiple OCSP responses
  * in the fd's data, which may be sent as part of a server side cert_status
  * handshake message. Parameter |responses| is for the server certificate of
diff -pu a/nss/lib/ssl/sslimpl.h b/nss/lib/ssl/sslimpl.h
--- a/nss/lib/ssl/sslimpl.h	2014-01-17 18:11:28.314468184 -0800
+++ b/nss/lib/ssl/sslimpl.h	2014-01-17 18:27:22.540248428 -0800
@@ -337,6 +337,7 @@ typedef struct sslOptionsStr {
     unsigned int enableOCSPStapling     : 1;  /* 25 */
     unsigned int enableNPN              : 1;  /* 26 */
     unsigned int enableALPN             : 1;  /* 27 */
+    unsigned int enableSignedCertTimestamps : 1;  /* 28 */
 } sslOptions;
 
 typedef enum { sslHandshakingUndetermined = 0,
@@ -719,6 +720,11 @@ struct sslSessionIDStr {
              * resumption handshake to the original handshake. */
 	    SECItem           originalHandshakeHash;
 
+	    /* Signed certificate timestamps received in a TLS extension.
+	    ** (used only in client).
+	    */
+	    SECItem	      signedCertTimestamps;
+
 	    /* This lock is lazily initialized by CacheSID when a sid is first
 	     * cached. Before then, there is no need to lock anything because
 	     * the sid isn't being shared by anything.
@@ -827,6 +833,18 @@ struct TLSExtensionDataStr {
      * is beyond ssl3_HandleClientHello function. */
     SECItem *sniNameArr;
     PRUint32 sniNameArrSize;
+
+    /* Signed Certificate Timestamps extracted from the TLS extension.
+     * (client only).
+     * This container holds a temporary pointer to the extension data,
+     * until a session structure (the sec.ci.sid of an sslSocket) is setup
+     * that can hold a permanent copy of the data
+     * (in sec.ci.sid.u.ssl3.signedCertTimestamps).
+     * The data pointed to by this structure is neither explicitly allocated
+     * nor copied: the pointer points to the handshake message buffer and is
+     * only valid in the scope of ssl3_HandleServerHello.
+     */
+    SECItem signedCertTimestamps;
 };
 
 typedef SECStatus (*sslRestartTarget)(sslSocket *);
diff -pu a/nss/lib/ssl/sslnonce.c b/nss/lib/ssl/sslnonce.c
--- a/nss/lib/ssl/sslnonce.c	2014-01-17 18:11:28.314468184 -0800
+++ b/nss/lib/ssl/sslnonce.c	2014-01-17 18:23:17.956207890 -0800
@@ -131,6 +131,9 @@ ssl_DestroySID(sslSessionID *sid)
         if (sid->u.ssl3.originalHandshakeHash.data) {
             SECITEM_FreeItem(&sid->u.ssl3.originalHandshakeHash, PR_FALSE);
         }
+        if (sid->u.ssl3.signedCertTimestamps.data) {
+            SECITEM_FreeItem(&sid->u.ssl3.signedCertTimestamps, PR_FALSE);
+        }
 
         if (sid->u.ssl3.lock) {
             PR_DestroyRWLock(sid->u.ssl3.lock);
diff -pu a/nss/lib/ssl/sslsock.c b/nss/lib/ssl/sslsock.c
--- a/nss/lib/ssl/sslsock.c	2014-01-17 18:04:43.127747463 -0800
+++ b/nss/lib/ssl/sslsock.c	2014-01-17 18:44:09.246889487 -0800
@@ -87,7 +87,8 @@ static sslOptions ssl_defaults = {
     PR_TRUE,    /* cbcRandomIV        */
     PR_FALSE,   /* enableOCSPStapling */
     PR_TRUE,    /* enableNPN          */
-    PR_FALSE    /* enableALPN         */
+    PR_FALSE,   /* enableALPN         */
+    PR_FALSE    /* enableSignedCertTimestamps */
 };
 
 /*
@@ -787,6 +788,10 @@ SSL_OptionSet(PRFileDesc *fd, PRInt32 wh
 	ss->opt.enableALPN = on;
 	break;
 
+      case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
+	ss->opt.enableSignedCertTimestamps = on;
+	break;
+
       default:
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
 	rv = SECFailure;
@@ -859,6 +864,9 @@ SSL_OptionGet(PRFileDesc *fd, PRInt32 wh
     case SSL_ENABLE_OCSP_STAPLING: on = ss->opt.enableOCSPStapling; break;
     case SSL_ENABLE_NPN:          on = ss->opt.enableNPN;          break;
     case SSL_ENABLE_ALPN:         on = ss->opt.enableALPN;         break;
+    case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
+	on = ss->opt.enableSignedCertTimestamps;
+	break;
 
     default:
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
@@ -922,6 +930,9 @@ SSL_OptionGetDefault(PRInt32 which, PRBo
        break;
     case SSL_ENABLE_NPN:          on = ssl_defaults.enableNPN;          break;
     case SSL_ENABLE_ALPN:         on = ssl_defaults.enableALPN;         break;
+    case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
+	on = ssl_defaults.enableSignedCertTimestamps;
+	break;
 
     default:
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
@@ -1097,6 +1108,10 @@ SSL_OptionSetDefault(PRInt32 which, PRBo
 	ssl_defaults.enableALPN = on;
 	break;
 
+      case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
+	ssl_defaults.enableSignedCertTimestamps = on;
+	break;
+
       default:
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
 	return SECFailure;
@@ -1921,6 +1936,29 @@ SSL_PeerStapledOCSPResponses(PRFileDesc
     return &ss->sec.ci.sid->peerCertStatus;
 }
 
+const SECItem *
+SSL_PeerSignedCertTimestamps(PRFileDesc *fd)
+{
+    sslSocket *ss = ssl_FindSocket(fd);
+
+    if (!ss) {
+       SSL_DBG(("%d: SSL[%d]: bad socket in SSL_PeerSignedCertTimestamps",
+		SSL_GETPID(), fd));
+       return NULL;
+    }
+
+    if (!ss->sec.ci.sid) {
+       PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
+       return NULL;
+    }
+
+    if (ss->sec.ci.sid->version < SSL_LIBRARY_VERSION_3_0) {
+	PORT_SetError(SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_SSL2);
+	return NULL;
+    }
+    return &ss->sec.ci.sid->u.ssl3.signedCertTimestamps;
+}
+
 SECStatus
 SSL_HandshakeResumedSession(PRFileDesc *fd, PRBool *handshake_resumed) {
     sslSocket *ss = ssl_FindSocket(fd);
diff -pu a/nss/lib/ssl/sslt.h b/nss/lib/ssl/sslt.h
--- a/nss/lib/ssl/sslt.h	2014-01-17 18:10:16.793281867 -0800
+++ b/nss/lib/ssl/sslt.h	2014-01-17 18:23:17.956207890 -0800
@@ -202,6 +202,7 @@ typedef enum {
     ssl_signature_algorithms_xtn     = 13,
     ssl_use_srtp_xtn                 = 14,
     ssl_app_layer_protocol_xtn       = 16,
+    ssl_signed_certificate_timestamp_xtn = 18,   /* RFC 6962 */
     ssl_session_ticket_xtn           = 35,
     ssl_next_proto_nego_xtn          = 13172,
     ssl_channel_id_xtn               = 30032,
@@ -209,6 +210,6 @@ typedef enum {
     ssl_renegotiation_info_xtn       = 0xff01	/* experimental number */
 } SSLExtensionType;
 
-#define SSL_MAX_EXTENSIONS             11 /* doesn't include ssl_padding_xtn. */
+#define SSL_MAX_EXTENSIONS             12 /* doesn't include ssl_padding_xtn. */
 
 #endif /* __sslt_h_ */