diff --git a/mozilla/view/src/nsViewManager.cpp b/mozilla/view/src/nsViewManager.cpp
index 463dca162f7..a05e3ce1f7c 100644
--- a/mozilla/view/src/nsViewManager.cpp
+++ b/mozilla/view/src/nsViewManager.cpp
@@ -90,7 +90,7 @@ static NS_DEFINE_CID(kEventQueueServiceCID, NS_EVENTQUEUESERVICE_CID);
    we ask for a specific z-order, we don't assume that widget z-ordering actually works.
 */
 
-#define NO_DOUBLE_BUFFER
+//#define NO_DOUBLE_BUFFER
 
 // if defined widget changes like moves and resizes are defered until and done
 // all in one pass.