diff --git a/layout/base/nsPresState.h b/layout/base/nsPresState.h
index ced3eae76feb..5e780b0f5b6a 100644
--- a/layout/base/nsPresState.h
+++ b/layout/base/nsPresState.h
@@ -111,6 +111,16 @@ public:
     return mDroppedDown;
   }
 
+  void SetPreviewText(const nsAString& aValue)
+  {
+    mPreviewText = aValue;
+  }
+
+  void GetPreviewText(nsAString& aValue)
+  {
+    aValue = mPreviewText;
+  }
+
 // MEMBER VARIABLES
 protected:
   nsCOMPtr<nsISupports> mContentData;
@@ -121,6 +131,7 @@ protected:
   bool mDisabledSet;
   bool mDisabled;
   bool mDroppedDown;
+  nsString mPreviewText;
 };
 
 #endif /* nsPresState_h_ */
diff --git a/layout/forms/nsComboboxControlFrame.cpp b/layout/forms/nsComboboxControlFrame.cpp
index 191f16177cac..c93c9b73a63a 100644
--- a/layout/forms/nsComboboxControlFrame.cpp
+++ b/layout/forms/nsComboboxControlFrame.cpp
@@ -1681,6 +1681,7 @@ nsComboboxControlFrame::SaveState(nsPresState** aState)
   MOZ_ASSERT(!(*aState));
   (*aState) = new nsPresState();
   (*aState)->SetDroppedDown(mDroppedDown);
+  (*aState)->SetPreviewText(mPreviewText);
   return NS_OK;
 }
 
@@ -1690,6 +1691,7 @@ nsComboboxControlFrame::RestoreState(nsPresState* aState)
   if (!aState) {
     return NS_ERROR_FAILURE;
   }
+  aState->GetPreviewText(mPreviewText);
   ShowList(aState->GetDroppedDown()); // might destroy us
   return NS_OK;
 }