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diff --git a/ipc/glue/ExtensionKitUtils.h b/ipc/glue/ExtensionKitUtils.h
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+++ b/ipc/glue/ExtensionKitUtils.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_ipc_ExtensionKitUtils_h
+#define mozilla_ipc_ExtensionKitUtils_h
+
+#include <functional>
+#include <xpc/xpc.h>
+#include "mozilla/DarwinObjectPtr.h"
+#include "mozilla/Result.h"
+#include "mozilla/ResultVariant.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/ipc/LaunchError.h"
+
+namespace mozilla::ipc {
+
+class BEProcessCapabilityGrantDeleter {
+ public:
+  void operator()(void* aGrant) const;
+};
+
+using UniqueBEProcessCapabilityGrant =
+    mozilla::UniquePtr<void, BEProcessCapabilityGrantDeleter>;
+
+class ExtensionKitProcess {
+ public:
+  enum class Kind {
+    WebContent,
+    Networking,
+    Rendering,
+  };
+
+  // Called to start the process. The `aCompletion` function may be executed on
+  // a background libdispatch thread.
+  static void StartProcess(
+      Kind aKind,
+      const std::function<void(Result<ExtensionKitProcess, LaunchError>&&)>&
+          aCompletion);
+
+  // Get the kind of process being started.
+  Kind GetKind() const { return mKind; }
+
+  // Make an xpc_connection_t to this process. If an error is encountered,
+  // `aError` will be populated with the error.
+  //
+  // Ownership over the newly created connection is returned to the caller.
+  // The connection is returned in a suspended state, and must be resumed.
+  DarwinObjectPtr<xpc_connection_t> MakeLibXPCConnection();
+
+  UniqueBEProcessCapabilityGrant GrantForegroundCapability();
+
+  // Invalidate the process, indicating that it should be cleaned up &
+  // destroyed.
+  void Invalidate();
+
+  // Explicit copy constructors
+  ExtensionKitProcess(const ExtensionKitProcess&);
+  ExtensionKitProcess& operator=(const ExtensionKitProcess&);
+
+  // Release the object when completed.
+  ~ExtensionKitProcess();
+
+ private:
+  ExtensionKitProcess(Kind aKind, void* aProcessObject)
+      : mKind(aKind), mProcessObject(aProcessObject) {}
+
+  // Type tag for `mProcessObject`.
+  Kind mKind;
+
+  // This is one of `BEWebContentProcess`, `BENetworkingProcess` or
+  // `BERenderingProcess`. It has been type erased to be usable from C++ code.
+  void* mProcessObject;
+};
+
+}  // namespace mozilla::ipc
+
+#endif  // mozilla_ipc_ExtensionKitUtils_h