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diff --git a/dom/base/AutoSuppressEventHandlingAndSuspend.h b/dom/base/AutoSuppressEventHandlingAndSuspend.h
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+++ b/dom/base/AutoSuppressEventHandlingAndSuspend.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef dom_base_AutoSuppressEventHandlingAndSuspend_h
+#define dom_base_AutoSuppressEventHandlingAndSuspend_h
+
+#include "mozilla/dom/Document.h"
+#include "nsCOMPtr.h"
+#include "nsPIDOMWindow.h"
+#include "nsTArray.h"
+
+namespace mozilla::dom {
+
+class BrowsingContext;
+class BrowsingContextGroup;
+
+/**
+ * Suppresses event handling and suspends the active inner window for all
+ * in-process documents in a BrowsingContextGroup. This should be used while
+ * spinning the event loop for a synchronous operation (like `window.open()`)
+ * which affects operations in any other window in the same BrowsingContext
+ * group.
+ */
+
+class MOZ_RAII AutoSuppressEventHandlingAndSuspend {
+ public:
+  explicit AutoSuppressEventHandlingAndSuspend(BrowsingContextGroup* aGroup);
+  ~AutoSuppressEventHandlingAndSuspend();
+
+ private:
+  void SuppressBrowsingContext(BrowsingContext* aBC);
+
+  AutoTArray<RefPtr<Document>, 16> mDocuments;
+  AutoTArray<nsCOMPtr<nsPIDOMWindowInner>, 16> mWindows;
+};
+}  // namespace mozilla::dom
+
+#endif