diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index 5f7d9e6b45bf..9437f1386f2f 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -4666,7 +4666,7 @@ pref("network.tcp.keepalive.retry_interval", 1); // seconds
 pref("network.tcp.keepalive.probe_count", 4);
 #endif
 
-pref("network.tcp.tcp_fastopen_enable", false);
+pref("network.tcp.tcp_fastopen_enable", true);
 pref("network.tcp.tcp_fastopen_consecutive_failure_limit", 5);
 
 // Whether to disable acceleration for all widgets.
diff --git a/netwerk/base/TCPFastOpenLayer.cpp b/netwerk/base/TCPFastOpenLayer.cpp
index 44b7122a2f52..5013a4d6691f 100644
--- a/netwerk/base/TCPFastOpenLayer.cpp
+++ b/netwerk/base/TCPFastOpenLayer.cpp
@@ -378,8 +378,8 @@ TCPFastOpenFinish(PRFileDesc *fd, PRErrorCode &err,
   // If sendto is not implemented it points to _PR_InvalidInt, therefore we
   // check if sendto != _PR_InvalidInt. _PR_InvalidInt is exposed so we use
   // reserved_fn_0 which also points to _PR_InvalidInt.
-  if (!secret->mFirstPacketBufLen ||
-      (tfoFd->lower->methods->sendto == (PRSendtoFN)tfoFd->lower->methods->reserved_fn_0)) {
+//  if (!secret->mFirstPacketBufLen ||
+//      (tfoFd->lower->methods->sendto == (PRSendtoFN)tfoFd->lower->methods->reserved_fn_0)) {
     // Because of the way our nsHttpTransaction dispatch work, it can happened
     // that data has not been written into the socket.
     // In this case we can just call connect.
@@ -396,7 +396,7 @@ TCPFastOpenFinish(PRFileDesc *fd, PRErrorCode &err,
         SOCKET_LOG(("TCPFastOpenFinish - sendto not implemented.\n"));
         fastOpenNotSupported = true;
     }
-  } else {
+/*  } else {
     // We have some data ready in the buffer we will send it with the syn
     // packet.
     PRInt32 rv = (tfoFd->lower->methods->sendto)(tfoFd->lower,
@@ -437,6 +437,7 @@ TCPFastOpenFinish(PRFileDesc *fd, PRErrorCode &err,
       }
     }
   }
+*/
 
   if (result == PR_IN_PROGRESS_ERROR) {
     secret->mState = TCPFastOpenSecret::WAITING_FOR_CONNECTCONTINUE;