diff --git a/netwerk/base/nsSocketTransport2.cpp b/netwerk/base/nsSocketTransport2.cpp
index 92df8ad006..6ccf2f1077 100644
--- a/netwerk/base/nsSocketTransport2.cpp
+++ b/netwerk/base/nsSocketTransport2.cpp
@@ -931,6 +931,7 @@ nsresult
 nsSocketTransport::InitWithConnectedSocket(PRFileDesc *fd, const NetAddr *addr)
 {
     MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread, "wrong thread");
+    NS_ASSERTION(!mFD.IsInitialized(), "already initialized");
 
     char buf[kNetAddrMaxCStrBufSize];
     NetAddrToString(addr, buf, sizeof(buf));
@@ -956,7 +957,6 @@ nsSocketTransport::InitWithConnectedSocket(PRFileDesc *fd, const NetAddr *addr)
     {
         MutexAutoLock lock(mLock);
 
-        NS_ASSERTION(!mFD.IsInitialized(), "already initialized");
         mFD = fd;
         mFDref = 1;
         mFDconnected = 1;
@@ -1031,7 +1031,6 @@ nsSocketTransport::ResolveHost()
                 this, SocketHost().get(), SocketPort(),
                 mConnectionFlags & nsSocketTransport::BYPASS_CACHE ?
                 " bypass cache" : ""));
-    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
 
     nsresult rv;
 
@@ -1238,7 +1237,6 @@ nsresult
 nsSocketTransport::InitiateSocket()
 {
     SOCKET_LOG(("nsSocketTransport::InitiateSocket [this=%p]\n", this));
-    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
 
     nsresult rv;
     bool isLocal;
@@ -1322,14 +1320,11 @@ nsSocketTransport::InitiateSocket()
     //
     // if we already have a connected socket, then just attach and return.
     //
-    {
-      MutexAutoLock lock(mLock);
-      if (mFD.IsInitialized()) {
+    if (mFD.IsInitialized()) {
         rv = mSocketTransportService->AttachSocket(mFD, this);
         if (NS_SUCCEEDED(rv))
-          mAttached = true;
+            mAttached = true;
         return rv;
-      }
     }
 
     //
@@ -1394,20 +1389,19 @@ nsSocketTransport::InitiateSocket()
     opt.value.linger.linger = 0;
     PR_SetSocketOption(fd, &opt);
 #endif
-    // up to here, mFD will only be accessed by us
-    
+
+    // inform socket transport about this newly created socket...
+    rv = mSocketTransportService->AttachSocket(fd, this);
+    if (NS_FAILED(rv)) {
+        CloseSocket(fd);
+        return rv;
+    }
+    mAttached = true;
+
     // assign mFD so that we can properly handle OnSocketDetached before we've
     // established a connection.
     {
         MutexAutoLock lock(mLock);
-        // inform socket transport about this newly created socket...
-        rv = mSocketTransportService->AttachSocket(fd, this);
-        if (NS_FAILED(rv)) {
-            CloseSocket(fd);
-            return rv;
-        }
-        mAttached = true;
-
         mFD = fd;
         mFDref = 1;
         mFDconnected = false;
@@ -1552,12 +1546,8 @@ nsSocketTransport::RecoverFromError()
 
     nsresult rv;
 
-#ifdef DEBUG
-    {
-        MutexAutoLock lock(mLock);
-        NS_ASSERTION(!mFDconnected, "socket should not be connected");
-    }
-#endif
+    // OK to check this outside mLock
+    NS_ASSERTION(!mFDconnected, "socket should not be connected");
 
     // all connection failures need to be reported to DNS so that the next
     // time we will use a different address if available.
@@ -1809,7 +1799,6 @@ nsSocketTransport::ReleaseFD_Locked(PRFileDesc *fd)
 void
 nsSocketTransport::OnSocketEvent(uint32_t type, nsresult status, nsISupports *param)
 {
-    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
     SOCKET_LOG(("nsSocketTransport::OnSocketEvent [this=%p type=%u status=%x param=%p]\n",
         this, type, status, param));
 
@@ -1922,7 +1911,6 @@ nsSocketTransport::OnSocketEvent(uint32_t type, nsresult status, nsISupports *pa
 void
 nsSocketTransport::OnSocketReady(PRFileDesc *fd, int16_t outFlags)
 {
-    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
     SOCKET_LOG(("nsSocketTransport::OnSocketReady [this=%p outFlags=%hd]\n",
         this, outFlags));
 
@@ -2431,7 +2419,6 @@ nsSocketTransport::Bind(NetAddr *aLocalAddr)
     NS_ENSURE_ARG(aLocalAddr);
 
     MutexAutoLock lock(mLock);
-    MOZ_ASSERT(OnSocketThread(), "not on socket thread");
     if (mAttached) {
         return NS_ERROR_FAILURE;
     }
diff --git a/netwerk/base/nsSocketTransport2.h b/netwerk/base/nsSocketTransport2.h
index 89b75efa57..cb107e6e79 100644
--- a/netwerk/base/nsSocketTransport2.h
+++ b/netwerk/base/nsSocketTransport2.h
@@ -350,13 +350,11 @@ private:
 
     void OnMsgInputPending()
     {
-        MOZ_ASSERT(OnSocketThread(), "not on socket thread");
         if (mState == STATE_TRANSFERRING)
             mPollFlags |= (PR_POLL_READ | PR_POLL_EXCEPT);
     }
     void OnMsgOutputPending()
     {
-        MOZ_ASSERT(OnSocketThread(), "not on socket thread");
         if (mState == STATE_TRANSFERRING)
             mPollFlags |= (PR_POLL_WRITE | PR_POLL_EXCEPT);
     }