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diff --git a/xpcom/io/nsAppDirectoryServiceDefs.h b/xpcom/io/nsAppDirectoryServiceDefs.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 nsAppDirectoryServiceDefs_h___
+#define nsAppDirectoryServiceDefs_h___
+
+//========================================================================================
+//
+// Defines property names for directories available from standard
+// nsIDirectoryServiceProviders. These keys are not guaranteed to exist because
+// the nsIDirectoryServiceProviders which provide them are optional.
+//
+// Keys whose definition ends in "DIR" or "FILE" return a single nsIFile (or
+// subclass). Keys whose definition ends in "LIST" return an nsISimpleEnumerator
+// which enumerates a list of file objects.
+//
+// System and XPCOM level properties are defined in nsDirectoryServiceDefs.h.
+//
+//========================================================================================
+
+// --------------------------------------------------------------------------------------
+// Files and directories which exist on a per-product basis
+// --------------------------------------------------------------------------------------
+
+#define NS_APP_APPLICATION_REGISTRY_FILE "AppRegF"
+#define NS_APP_APPLICATION_REGISTRY_DIR "AppRegD"
+
+#define NS_APP_DEFAULTS_50_DIR "DefRt"  // The root dir of all defaults dirs
+#define NS_APP_PREF_DEFAULTS_50_DIR "PrfDef"
+
+#define NS_APP_USER_PROFILES_ROOT_DIR \
+  "DefProfRt"  // The dir where user profile dirs live.
+#define NS_APP_USER_PROFILES_LOCAL_ROOT_DIR \
+  "DefProfLRt"  // The dir where user profile temp dirs live.
+
+#define NS_APP_RES_DIR "ARes"
+#define NS_APP_CHROME_DIR "AChrom"
+
+#define NS_APP_CHROME_DIR_LIST "AChromDL"
+
+// --------------------------------------------------------------------------------------
+// Files and directories which exist on a per-profile basis
+// These locations are typically provided by the profile mgr
+// --------------------------------------------------------------------------------------
+
+// In a shared profile environment, prefixing a profile-relative
+// key with NS_SHARED returns a location that is shared by
+// other users of the profile. Without this prefix, the consumer
+// has exclusive access to this location.
+
+#define NS_SHARED "SHARED"
+
+#define NS_APP_PREFS_50_DIR "PrefD"  // Directory which contains user prefs
+#define NS_APP_PREFS_50_FILE "PrefF"
+#define NS_APP_PREFS_DEFAULTS_DIR_LIST "PrefDL"
+#define NS_APP_PREFS_OVERRIDE_DIR \
+  "PrefDOverride"  // Directory for per-profile defaults
+
+#define NS_APP_USER_PROFILE_50_DIR "ProfD"
+#define NS_APP_USER_PROFILE_LOCAL_50_DIR "ProfLD"
+
+#define NS_APP_USER_CHROME_DIR "UChrm"
+
+#define NS_APP_USER_PANELS_50_FILE "UPnls"
+#define NS_APP_CACHE_PARENT_DIR "cachePDir"
+
+#define NS_APP_INSTALL_CLEANUP_DIR \
+  "XPIClnupD"  // location of xpicleanup.dat xpicleanup.exe
+
+#define NS_APP_INDEXEDDB_PARENT_DIR "indexedDBPDir"
+
+#define NS_APP_PERMISSION_PARENT_DIR "permissionDBPDir"
+
+#if defined(MOZ_CONTENT_TEMP_DIR)
+//
+// NS_APP_CONTENT_PROCESS_TEMP_DIR refers to a directory that is read and
+// write accessible from a sandboxed content process. The key may be used in
+// either process, but the directory is intended to be used for short-lived
+// files that need to be saved to the filesystem by the content process and
+// don't need to survive browser restarts. The directory is reset on startup.
+//
+// When MOZ_CONTENT_TEMP_DIR is defined and sandboxing is enabled (versus
+// manually disabled via prefs), the content process replaces NS_OS_TEMP_DIR
+// with NS_APP_CONTENT_PROCESS_TEMP_DIR so that legacy code in content
+// attempting to write to NS_OS_TEMP_DIR will write to
+// NS_APP_CONTENT_PROCESS_TEMP_DIR instead. When MOZ_SANDBOX is
+// defined but sandboxing is disabled, NS_APP_CONTENT_PROCESS_TEMP_DIR
+// falls back to NS_OS_TEMP_DIR in both content and chrome processes.
+//
+// New code should avoid writing to the filesystem from the content process
+// and should instead proxy through the parent process whenever possible.
+//
+// At present, all sandboxed content processes use the same directory for
+// NS_APP_CONTENT_PROCESS_TEMP_DIR, but that should not be relied upon.
+//
+#  define NS_APP_CONTENT_PROCESS_TEMP_DIR "ContentTmpD"
+#endif  // defined(MOZ_SANDBOX)
+
+#endif  // nsAppDirectoryServiceDefs_h___