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diff --git a/toolkit/xre/nsIAppStartupNotifier.h b/toolkit/xre/nsIAppStartupNotifier.h
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+++ b/toolkit/xre/nsIAppStartupNotifier.h
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+/* -*- Mode: C++; tab-width: 4; 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/. */
+
+#ifndef nsIAppStartupNotifier_h___
+#define nsIAppStartupNotifier_h___
+
+/*
+ Some components need to be run at the startup of mozilla or embedding - to
+ start new services etc.
+
+ This interface provides a generic way to start up arbitrary components
+ without requiring them to hack into main1() (or into NS_InitEmbedding) as
+ it's currently being done for services such as wallet, command line handlers
+ etc.
+
+ We will have a category called "app-startup" which components register
+ themselves in using the CategoryManager.
+
+ Components can also (optionally) add the word "service," as a prefix
+ to the "value" they pass in during a call to AddCategoryEntry() as
+ shown below:
+
+    categoryManager->AddCategoryEntry(APPSTARTUP_CATEGORY, "testcomp",
+                        "service," NS_WALLETSERVICE_CONTRACTID
+                        true, true,
+                        getter_Copies(previous));
+
+ Presence of the "service" keyword indicates the components desire to
+ be started as a service. When the "service" keyword is not present
+ we just do a do_CreateInstance.
+
+ When mozilla starts (and when NS_InitEmbedding()) is invoked
+ we create an instance of the AppStartupNotifier component (which
+ implements nsIObserver) and invoke its Observe() method.
+
+ Observe()  will enumerate the components registered into the
+ APPSTARTUP_CATEGORY and notify them that startup has begun
+ and release them.
+*/
+
+#define APPSTARTUP_CATEGORY "app-startup"
+
+/*
+ Please note that there's not a new interface in this file.
+ We're just leveraging nsIObserver instead of creating a
+ new one
+
+ This file exists solely to provide the defines above
+*/
+
+#endif /* nsIAppStartupNotifier_h___ */