diff --git a/dom/base/nsContentUtils.cpp b/dom/base/nsContentUtils.cpp
index a49283d08e08..197466bf6d64 100644
--- a/dom/base/nsContentUtils.cpp
+++ b/dom/base/nsContentUtils.cpp
@@ -7363,14 +7363,14 @@ nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
           nsAutoString dataAsString;
           text->GetData(dataAsString);
           IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-          item->flavor() = nsCString(flavorStr);
-          item->data() = nsString(dataAsString);
+          item->flavor() = flavorStr;
+          item->data() = dataAsString;
         } else if (ctext) {
           nsAutoCString dataAsString;
           ctext->GetData(dataAsString);
           IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-          item->flavor() = nsCString(flavorStr);
-          item->data() = nsCString(dataAsString);
+          item->flavor() = flavorStr;
+          item->data() = dataAsString;
         } else {
           nsCOMPtr<nsISupportsInterfacePointer> sip =
             do_QueryInterface(data);
@@ -7382,7 +7382,7 @@ nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
           nsCOMPtr<nsIInputStream> stream(do_QueryInterface(data));
           if (stream) {
             IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-            item->flavor() = nsCString(flavorStr);
+            item->flavor() = flavorStr;
 
             nsCString imageData;
             NS_ConsumeStream(stream, UINT32_MAX, imageData);
@@ -7405,7 +7405,7 @@ nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
                 nsContentUtils::GetSurfaceData(dataSurface, &length, &stride);
 
               IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-              item->flavor() = nsCString(flavorStr);
+              item->flavor() = flavorStr;
               // Turn item->data() into an nsCString prior to accessing it.
               item->data() = EmptyCString();
               item->data().get_nsCString().Adopt(surfaceData.release(), length);
@@ -7481,7 +7481,7 @@ nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
             }
 
             IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-            item->flavor() = nsCString(flavorStr);
+            item->flavor() = flavorStr;
             item->data() = data;
           } else {
             // This is a hack to support kFilePromiseMime.
@@ -7490,12 +7490,12 @@ nsContentUtils::TransferableToIPCTransferable(nsITransferable* aTransferable,
             // nsContentAreaDragDropDataProvider as nsIFlavorDataProvider.
             if (flavorStr.EqualsLiteral(kFilePromiseMime)) {
               IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-              item->flavor() = nsCString(flavorStr);
+              item->flavor() = flavorStr;
               item->data() = NS_ConvertUTF8toUTF16(flavorStr);
             } else if (!data) {
               // Empty element, transfer only the flavor
               IPCDataTransferItem* item = aIPCDataTransfer->items().AppendElement();
-              item->flavor() = nsCString(flavorStr);
+              item->flavor() = flavorStr;
               item->data() = EmptyCString();
               continue;
             }