diff --git a/content/events/src/nsEventStateManager.cpp b/content/events/src/nsEventStateManager.cpp
index 3e48f21f8d0c..6669b1ae84d7 100644
--- a/content/events/src/nsEventStateManager.cpp
+++ b/content/events/src/nsEventStateManager.cpp
@@ -184,6 +184,7 @@ static PRBool sKeyCausesActivation = PR_TRUE;
 static PRUint32 sESMInstanceCount = 0;
 static PRInt32 sChromeAccessModifier = 0, sContentAccessModifier = 0;
 PRInt32 nsEventStateManager::sUserInputEventDepth = 0;
+PRBool nsEventStateManager::sNormalLMouseEventInProcess = PR_FALSE;
 
 static PRUint32 gMouseOrKeyboardEventCounter = 0;
 static nsITimer* gUserInteractionTimer = nsnull;
@@ -778,7 +779,6 @@ nsEventStateManager::nsEventStateManager()
     mLClickCount(0),
     mMClickCount(0),
     mRClickCount(0),
-    mNormalLMouseEventInProcess(PR_FALSE),
     m_haveShutdown(PR_FALSE),
     mLastLineScrollConsumedX(PR_FALSE),
     mLastLineScrollConsumedY(PR_FALSE),
@@ -1085,7 +1085,7 @@ nsEventStateManager::PreHandleEvent(nsPresContext* aPresContext,
 #endif
       mLClickCount = ((nsMouseEvent*)aEvent)->clickCount;
       SetClickCount(aPresContext, (nsMouseEvent*)aEvent, aStatus);
-      mNormalLMouseEventInProcess = PR_TRUE;
+      sNormalLMouseEventInProcess = PR_TRUE;
       break;
     case nsMouseEvent::eMiddleButton:
       mMClickCount = ((nsMouseEvent*)aEvent)->clickCount;
@@ -1109,7 +1109,7 @@ nsEventStateManager::PreHandleEvent(nsPresContext* aPresContext,
 #ifndef XP_OS2
         StopTrackingDragGesture();
 #endif
-        mNormalLMouseEventInProcess = PR_FALSE;
+        sNormalLMouseEventInProcess = PR_FALSE;
       case nsMouseEvent::eRightButton:
 #ifdef XP_OS2
         StopTrackingDragGesture();
@@ -2799,7 +2799,7 @@ nsEventStateManager::PostHandleEvent(nsPresContext* aPresContext,
   case NS_MOUSE_BUTTON_DOWN:
     {
       if (static_cast<nsMouseEvent*>(aEvent)->button == nsMouseEvent::eLeftButton &&
-          !mNormalLMouseEventInProcess) {
+          !sNormalLMouseEventInProcess) {
         // We got a mouseup event while a mousedown event was being processed.
         // Make sure that the capturing content is cleared.
         nsIPresShell::SetCapturingContent(nsnull, 0);
@@ -4493,7 +4493,7 @@ nsEventStateManager::EventStatusOK(nsGUIEvent* aEvent, PRBool *aOK)
   *aOK = PR_TRUE;
   if (aEvent->message == NS_MOUSE_BUTTON_DOWN &&
       static_cast<nsMouseEvent*>(aEvent)->button == nsMouseEvent::eLeftButton) {
-    if (!mNormalLMouseEventInProcess) {
+    if (!sNormalLMouseEventInProcess) {
       *aOK = PR_FALSE;
     }
   }
diff --git a/content/events/src/nsEventStateManager.h b/content/events/src/nsEventStateManager.h
index 9d5d99529809..e466fe912994 100644
--- a/content/events/src/nsEventStateManager.h
+++ b/content/events/src/nsEventStateManager.h
@@ -387,8 +387,6 @@ protected:
   PRUint32 mMClickCount;
   PRUint32 mRClickCount;
 
-  PRPackedBool mNormalLMouseEventInProcess;
-
   PRPackedBool m_haveShutdown;
 
   // Array for accesskey support
@@ -399,6 +397,8 @@ protected:
   PRPackedBool mLastLineScrollConsumedY;
 
   static PRInt32 sUserInputEventDepth;
+  
+  static PRBool sNormalLMouseEventInProcess;
 
   // Functions used for click hold context menus
   PRBool mClickHoldContextMenu;