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diff --git a/mozglue/baseprofiler/public/BaseAndGeckoProfilerDetail.h b/mozglue/baseprofiler/public/BaseAndGeckoProfilerDetail.h
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+++ b/mozglue/baseprofiler/public/BaseAndGeckoProfilerDetail.h
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+/* -*- Mode: C++; tab-width: 2; 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/. */
+
+// Internal Base and Gecko Profiler utilities.
+// It should declare or define things that are used in both profilers, but not
+// needed outside of the profilers.
+// In particular, it is *not* included in popular headers like BaseProfiler.h
+// and GeckoProfiler.h, to avoid rebuilding the world when this is modified.
+
+#ifndef BaseAndGeckoProfilerDetail_h
+#define BaseAndGeckoProfilerDetail_h
+
+#include "mozilla/BaseProfilerUtils.h"
+#include "mozilla/Span.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Types.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+
+class ProfileBufferChunkManagerWithLocalLimit;
+
+// Centrally defines the version of the gecko profiler JSON format.
+const int GECKO_PROFILER_FORMAT_VERSION = 29;
+
+namespace baseprofiler::detail {
+
+[[nodiscard]] MFBT_API TimeStamp GetProfilingStartTime();
+
+[[nodiscard]] MFBT_API UniquePtr<ProfileBufferChunkManagerWithLocalLimit>
+ExtractBaseProfilerChunkManager();
+
+// If the current thread is registered, returns its registration time, otherwise
+// a null timestamp.
+[[nodiscard]] MFBT_API TimeStamp GetThreadRegistrationTime();
+
+}  // namespace baseprofiler::detail
+
+namespace profiler::detail {
+
+// True if the filter is exactly "pid:<aPid>".
+[[nodiscard]] MFBT_API bool FilterHasPid(
+    const char* aFilter, baseprofiler::BaseProfilerProcessId aPid =
+                             baseprofiler::profiler_current_process_id());
+
+// Only true if the filters only contain "pid:..." strings, and *none* of them
+// is exactly "pid:<aPid>". E.g.:
+// - [], 123                     -> false (no pids)
+// - ["main"], 123               -> false (not all pids)
+// - ["main", "pid:123"], 123    -> false (not all pids)
+// - ["pid:123"], 123            -> false (all pids, including "pid:123")
+// - ["pid:123", "pid:456"], 123 -> false (all pids, including "pid:123")
+// - ["pid:456"], 123            -> true (all pids, but no "pid:123")
+// - ["pid:456", "pid:789"], 123 -> true (all pids, but no "pid:123")
+[[nodiscard]] MFBT_API bool FiltersExcludePid(
+    Span<const char* const> aFilters,
+    baseprofiler::BaseProfilerProcessId aPid =
+        baseprofiler::profiler_current_process_id());
+
+}  // namespace profiler::detail
+
+}  // namespace mozilla
+
+#endif  // BaseAndGeckoProfilerDetail_h