--- a/widget/PuppetWidget.cpp
+++ b/widget/PuppetWidget.cpp
@@ -199,16 +199,25 @@ PuppetWidget::Show(bool aState)
   bool wasVisible = mVisible;
   mVisible = aState;
 
   if (mChild) {
     mChild->mVisible = aState;
   }
 
   if (!wasVisible && mVisible) {
+    // The previously attached widget listener is handy if
+    // we're transitioning from page to page without dropping
+    // layers (since we'll continue to show the old layers
+    // associated with that old widget listener). If the
+    // PuppetWidget was hidden, those layers are dropped,
+    // so the previously attached widget listener is really
+    // of no use anymore (and is actually actively harmful - see
+    // bug 1323586).
+    mPreviouslyAttachedWidgetListener = nullptr;
     Resize(mBounds.width, mBounds.height, false);
     Invalidate(mBounds);
   }
 
   return NS_OK;
 }
 
 NS_IMETHODIMP