From 932dde0dfeb1c56d159bdef16fe223442864a6e5 Mon Sep 17 00:00:00 2001
From: Gaming4JC <g4jc@hyperbola.info>
Date: Sat, 4 Jan 2020 10:08:13 -0500
Subject: [PATCH] Bug 1350960 - Release CustomElementReactionsStack in TabGroup
 thread when DocGroup is going away.

Note: In UXP we use non-Quantum thread checking implementation here.

Tag UXP Issue #1344
---
 dom/base/DocGroup.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/dom/base/DocGroup.cpp b/dom/base/DocGroup.cpp
index 226879985c..30c058f0c6 100644
--- a/dom/base/DocGroup.cpp
+++ b/dom/base/DocGroup.cpp
@@ -46,6 +46,9 @@ DocGroup::DocGroup(TabGroup* aTabGroup, const nsACString& aKey)
 DocGroup::~DocGroup()
 {
   MOZ_ASSERT(mDocuments.IsEmpty());
+  if (!NS_IsMainThread()) {
+     NS_ReleaseOnMainThread(mReactionsStack.forget());
+  }
   mTabGroup->mDocGroups.RemoveEntry(mKey);
 }