From 1f85f6ab9304b49017f54685fd406ee16264b540 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Mon, 2 May 2022 23:11:24 +0800
Subject: [PATCH] Revert "Issue #1860 - Follow-up: Make sure we don't add
 duplicate frames"

This reverts commit f039cc7ef858e07344e6ebee50482b3da13c4c15.
---
 layout/base/FrameLayerBuilder.cpp | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/layout/base/FrameLayerBuilder.cpp b/layout/base/FrameLayerBuilder.cpp
index ff4661e1c8..aa49c74cee 100644
--- a/layout/base/FrameLayerBuilder.cpp
+++ b/layout/base/FrameLayerBuilder.cpp
@@ -162,12 +162,7 @@ void
 FrameLayerBuilder::DisplayItemData::AddFrame(nsIFrame* aFrame)
 {
   MOZ_RELEASE_ASSERT(mLayer);
-  
-  // Make sure we don't add duplicate frames as we're storing these as vectors.
-  // See UXP Issue #1860
-  if (!mFrameList.Contains(aFrame)) {
-    mFrameList.AppendElement(aFrame);
-  }
+  mFrameList.AppendElement(aFrame);
 
   nsTArray<DisplayItemData*>* array =
     aFrame->GetProperty(FrameLayerBuilder::LayerManagerDataProperty());