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diff --git a/toolkit/mozapps/extensions/amIAddonPathService.idl b/toolkit/mozapps/extensions/amIAddonPathService.idl
new file mode 100644
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+++ b/toolkit/mozapps/extensions/amIAddonPathService.idl
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsISupports.idl"
+
+/**
+ * This service maps file system paths where add-ons reside to the ID
+ * of the add-on. Paths are added by the add-on manager. They can
+ * looked up by anyone.
+ */
+[scriptable, uuid(fcd9e270-dfb1-11e3-8b68-0800200c9a66)]
+interface amIAddonPathService : nsISupports
+{
+  /**
+   * Given a path to a file, return the ID of the add-on that the file belongs
+   * to. Returns an empty string if there is no add-on there. Note that if an
+   * add-on is located at /a/b/c, then looking up the path /a/b/c/d will return
+   * that add-on.
+   */
+  AString findAddonId(in AString path);
+
+  /**
+   * Call this function to inform the service that the given file system path is
+   * associated with the given add-on ID.
+   */
+  void insertPath(in AString path, in AString addonId);
+};