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diff --git a/docshell/base/timeline/AutoGlobalTimelineMarker.h b/docshell/base/timeline/AutoGlobalTimelineMarker.h
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index 000000000..2937cf3d7
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+++ b/docshell/base/timeline/AutoGlobalTimelineMarker.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 mozilla_AutoGlobalTimelineMarker_h_
+#define mozilla_AutoGlobalTimelineMarker_h_
+
+#include "mozilla/GuardObjects.h"
+#include "TimelineMarkerEnums.h"
+
+namespace mozilla {
+
+// # AutoGlobalTimelineMarker
+//
+// Similar to `AutoTimelineMarker`, but adds its traced marker to all docshells,
+// not a single particular one. This is useful for operations that aren't
+// associated with any one particular doc shell, or when it isn't clear which
+// docshell triggered the operation.
+//
+// Example usage:
+//
+//     {
+//       AutoGlobalTimelineMarker marker("Cycle Collection");
+//       nsCycleCollector* cc = GetCycleCollector();
+//       cc->Collect();
+//       ...
+//     }
+class MOZ_RAII AutoGlobalTimelineMarker
+{
+  MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER;
+
+  // The name of the marker we are adding.
+  const char* mName;
+  // Whether to capture the JS stack or not.
+  MarkerStackRequest mStackRequest;
+
+public:
+  explicit AutoGlobalTimelineMarker(const char* aName,
+                                    MarkerStackRequest aStackRequest = MarkerStackRequest::STACK
+                                    MOZ_GUARD_OBJECT_NOTIFIER_PARAM);
+  ~AutoGlobalTimelineMarker();
+
+  AutoGlobalTimelineMarker(const AutoGlobalTimelineMarker& aOther) = delete;
+  void operator=(const AutoGlobalTimelineMarker& aOther) = delete;
+};
+
+} // namespace mozilla
+
+#endif /* mozilla_AutoGlobalTimelineMarker_h_ */