diff --git a/content/base/src/nsContentUtils.cpp b/content/base/src/nsContentUtils.cpp
index 5892f477a04..f725acbc6d3 100644
--- a/content/base/src/nsContentUtils.cpp
+++ b/content/base/src/nsContentUtils.cpp
@@ -665,6 +665,7 @@ nsContentUtils::InitializeEventTable() {
     { nsGkAtoms::onvolumechange,                NS_VOLUMECHANGE, EventNameType_HTML, NS_EVENT_NULL },
 #endif // MOZ_MEDIA
     { nsGkAtoms::onMozAfterPaint,               NS_AFTERPAINT, EventNameType_None, NS_EVENT },
+    { nsGkAtoms::onMozBeforePaint,              NS_BEFOREPAINT, EventNameType_None, NS_EVENT_NULL },
 
     { nsGkAtoms::onMozScrolledAreaChanged,      NS_SCROLLEDAREACHANGED, EventNameType_None, NS_SCROLLAREA_EVENT },
 
diff --git a/content/base/src/nsGkAtomList.h b/content/base/src/nsGkAtomList.h
index e06cf4c6283..2b0640205f4 100644
--- a/content/base/src/nsGkAtomList.h
+++ b/content/base/src/nsGkAtomList.h
@@ -669,6 +669,7 @@ GK_ATOM(onmouseover, "onmouseover")
 GK_ATOM(onMozMouseHittest, "onMozMouseHittest")
 GK_ATOM(onmouseup, "onmouseup")
 GK_ATOM(onMozAfterPaint, "onMozAfterPaint")
+GK_ATOM(onMozBeforePaint, "onMozBeforePaint")
 GK_ATOM(onMozMousePixelScroll, "onMozMousePixelScroll")
 GK_ATOM(onMozScrolledAreaChanged, "onMozScrolledAreaChanged")
 GK_ATOM(ononline, "ononline")
diff --git a/content/events/src/nsDOMEvent.cpp b/content/events/src/nsDOMEvent.cpp
index 299c0b01e1a..4f29e7a24d0 100644
--- a/content/events/src/nsDOMEvent.cpp
+++ b/content/events/src/nsDOMEvent.cpp
@@ -91,6 +91,7 @@ static const char* const sEventNames[] = {
   "durationchange", "volumechange",
 #endif // MOZ_MEDIA
   "MozAfterPaint",
+  "MozBeforePaint",
   "MozSwipeGesture",
   "MozMagnifyGestureStart",
   "MozMagnifyGestureUpdate",
@@ -400,7 +401,7 @@ nsDOMEvent::GetCancelable(PRBool* aCancelable)
 NS_IMETHODIMP
 nsDOMEvent::GetTimeStamp(PRUint64* aTimeStamp)
 {
-  LL_UI2L(*aTimeStamp, mEvent->time);
+  *aTimeStamp = mEvent->time;
   return NS_OK;
 }
 
@@ -1302,6 +1303,8 @@ const char* nsDOMEvent::GetEventName(PRUint32 aEventType)
 #endif
   case NS_AFTERPAINT:
     return sEventNames[eDOMEvents_afterpaint];
+  case NS_BEFOREPAINT:
+    return sEventNames[eDOMEvents_beforepaint];
   case NS_SIMPLE_GESTURE_SWIPE:
     return sEventNames[eDOMEvents_MozSwipeGesture];
   case NS_SIMPLE_GESTURE_MAGNIFY_START:
diff --git a/content/events/src/nsDOMEvent.h b/content/events/src/nsDOMEvent.h
index 300fd0e69de..f655f474ba0 100644
--- a/content/events/src/nsDOMEvent.h
+++ b/content/events/src/nsDOMEvent.h
@@ -170,6 +170,7 @@ public:
     eDOMEvents_volumechange,
 #endif
     eDOMEvents_afterpaint,
+    eDOMEvents_beforepaint,
     eDOMEvents_MozSwipeGesture,
     eDOMEvents_MozMagnifyGestureStart,
     eDOMEvents_MozMagnifyGestureUpdate,
diff --git a/widget/public/nsGUIEvent.h b/widget/public/nsGUIEvent.h
index 575a04027fa..76c62b3591c 100644
--- a/widget/public/nsGUIEvent.h
+++ b/widget/public/nsGUIEvent.h
@@ -413,6 +413,7 @@ class nsHashKey;
 // paint notification events
 #define NS_NOTIFYPAINT_START    3400
 #define NS_AFTERPAINT           (NS_NOTIFYPAINT_START)
+#define NS_BEFOREPAINT          (NS_NOTIFYPAINT_START+1)
 
 // Simple gesture events
 #define NS_SIMPLE_GESTURE_EVENT_START    3500
@@ -534,7 +535,7 @@ public:
   nsIntPoint  refPoint;
   // Elapsed time, in milliseconds, from a platform-specific zero time
   // to the time the message was created
-  PRUint32    time;
+  PRUint64    time;
   // Flags to hold event flow stage and capture/bubble cancellation
   // status. This is used also to indicate whether the event is trusted.
   PRUint32    flags;