diff --git a/layout/xul/base/src/nsXULTooltipListener.cpp b/layout/xul/base/src/nsXULTooltipListener.cpp
index 4a13276e999..ee557a67aa6 100644
--- a/layout/xul/base/src/nsXULTooltipListener.cpp
+++ b/layout/xul/base/src/nsXULTooltipListener.cpp
@@ -303,6 +303,10 @@ nsXULTooltipListener::AddTooltipSupport(nsIContent* aNode)
                                 false, false);
   aNode->AddSystemEventListener(NS_LITERAL_STRING("mousemove"), this,
                                 false, false);
+  aNode->AddSystemEventListener(NS_LITERAL_STRING("mousedown"), this,
+                                false, false);
+  aNode->AddSystemEventListener(NS_LITERAL_STRING("mouseup"), this,
+                                false, false);
   aNode->AddSystemEventListener(NS_LITERAL_STRING("dragstart"), this,
                                 true, false);
 
@@ -317,6 +321,8 @@ nsXULTooltipListener::RemoveTooltipSupport(nsIContent* aNode)
 
   aNode->RemoveSystemEventListener(NS_LITERAL_STRING("mouseout"), this, false);
   aNode->RemoveSystemEventListener(NS_LITERAL_STRING("mousemove"), this, false);
+  aNode->RemoveSystemEventListener(NS_LITERAL_STRING("mousedown"), this, false);
+  aNode->RemoveSystemEventListener(NS_LITERAL_STRING("mouseup"), this, false);
   aNode->RemoveSystemEventListener(NS_LITERAL_STRING("dragstart"), this, true);
 
   return NS_OK;