deleted file mode 100644
--- a/js/ductwork/Makefile.in
+++ /dev/null
@@ -1,49 +0,0 @@
-# ***** BEGIN LICENSE BLOCK ***** 
-# Version: MPL 1.1/GPL 2.0/LGPL 2.1
-#
-# The contents of this file are subject to the Mozilla Public License Version
-# 1.1 (the "License"); you may not use this file except in compliance with
-# the License. You may obtain a copy of the License at
-# http://www.mozilla.org/MPL/
-#
-# Software distributed under the License is distributed on an "AS IS" basis,
-# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
-# for the specific language governing rights and limitations under the
-# License.
-#
-# The Original Code is the Mozilla Browser code.
-#
-# The Initial Developer of the Original Code is
-# Netscape Communications Corporation.
-# Portions created by the Initial Developer are Copyright (C) 2011
-# the Initial Developer. All Rights Reserved.
-#
-# Contributor(s):
-#  Jason Orendorff <jorendorff@mozilla.com>
-#
-# Alternatively, the contents of this file may be used under the terms of
-# either the GNU General Public License Version 2 or later (the "GPL"), or
-# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
-# in which case the provisions of the GPL or the LGPL are applicable instead
-# of those above. If you wish to allow use of your version of this file only
-# under the terms of either the GPL or the LGPL, and not to allow others to
-# use your version of this file under the terms of the MPL, indicate your
-# decision by deleting the provisions above and replace them with the notice
-# and other provisions required by the GPL or the LGPL. If you do not delete
-# the provisions above, a recipient may use your version of this file under
-# the terms of any one of the MPL, the GPL or the LGPL.
-#
-# ***** END LICENSE BLOCK *****
-
-DEPTH     = ../..
-topsrcdir = @top_srcdir@
-srcdir    = @srcdir@
-VPATH     = @srcdir@
-
-include $(topsrcdir)/config/config.mk
-
-PARALLEL_DIRS += \
-  debugger \
-  $(NULL)
-
-include $(topsrcdir)/config/rules.mk

deleted file mode 100644
--- a/js/ductwork/debugger/IJSDebugger.idl
+++ /dev/null
@@ -1,52 +0,0 @@
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- *   Mozilla Foundation
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *   Dave Camp <dcamp@mozilla.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#include "nsISupports.idl"
-
-/**
- * Do not use this interface. Instead, write:
- *     Components.utils.import("resource://gre/modules/jsdebugger.jsm");
- */
-[scriptable, uuid(2fc14cc6-4ed0-4bbf-a7dd-e535bf088eb5)]
-interface IJSDebugger : nsISupports
-{
-  /**
-   * Define the global Debugger constructor.
-   */
-  [implicit_jscontext]
-  void addClass();
-};

deleted file mode 100644
--- a/js/ductwork/debugger/JSDebugger.cpp
+++ /dev/null
@@ -1,111 +0,0 @@
-/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * The Mozilla Foundation <http://www.mozilla.org/>.
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *  Dave Camp <dcamp@mozilla.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#include "JSDebugger.h"
-#include "nsIXPConnect.h"
-#include "nsThreadUtils.h"
-#include "jsapi.h"
-#include "jsobj.h"
-#include "jsgc.h"
-#include "jsfriendapi.h"
-#include "jsdbgapi.h"
-#include "mozilla/ModuleUtils.h"
-#include "nsServiceManagerUtils.h"
-#include "nsMemory.h"
-
-#define JSDEBUGGER_CONTRACTID \
-  "@mozilla.org/jsdebugger;1"
-
-#define JSDEBUGGER_CID \
-{ 0x0365cbd5, 0xd46e, 0x4e94, { 0xa3, 0x9f, 0x83, 0xb6, 0x3c, 0xd1, 0xa9, 0x63 } }
-
-namespace mozilla {
-namespace jsdebugger {
-
-NS_GENERIC_FACTORY_CONSTRUCTOR(JSDebugger)
-
-NS_IMPL_ISUPPORTS1(JSDebugger, IJSDebugger)
-
-JSDebugger::JSDebugger()
-{
-}
-
-JSDebugger::~JSDebugger()
-{
-}
-
-NS_IMETHODIMP
-JSDebugger::AddClass(JSContext *cx)
-{
-  nsresult rv;
-  nsCOMPtr<nsIXPConnect> xpc = do_GetService(nsIXPConnect::GetCID(), &rv);
-
-  JSObject* global = JS_GetGlobalForScopeChain(cx);
-  if (!global) {
-    return NS_ERROR_NOT_AVAILABLE;
-  }
-
-  if (!JS_DefineDebuggerObject(cx, global)) {
-    return NS_ERROR_FAILURE;
-  }
-
-  return NS_OK;
-}
-
-}
-}
-
-NS_DEFINE_NAMED_CID(JSDEBUGGER_CID);
-
-static const mozilla::Module::CIDEntry kJSDebuggerCIDs[] = {
-  { &kJSDEBUGGER_CID, false, NULL, mozilla::jsdebugger::JSDebuggerConstructor },
-  { NULL }
-};
-
-static const mozilla::Module::ContractIDEntry kJSDebuggerContracts[] = {
-  { JSDEBUGGER_CONTRACTID, &kJSDEBUGGER_CID },
-  { NULL }
-};
-
-static const mozilla::Module kJSDebuggerModule = {
-  mozilla::Module::kVersion,
-  kJSDebuggerCIDs,
-  kJSDebuggerContracts
-};
-
-NSMODULE_DEFN(jsdebugger) = &kJSDebuggerModule;

deleted file mode 100644
--- a/js/ductwork/debugger/JSDebugger.h
+++ /dev/null
@@ -1,62 +0,0 @@
-/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is mozilla.org code.
- *
- * The Initial Developer of the Original Code is
- * The Mozilla Foundation <http://www.mozilla.org/>.
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *  Dave Camp <dcamp@mozilla.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-#ifndef COMPONENTS_JSDEBUGGER_H
-#define COMPONENTS_JSDEBUGGER_H
-
-#include "IJSDebugger.h"
-
-namespace mozilla {
-namespace jsdebugger {
-
-class JSDebugger : public IJSDebugger
-{
-public:
-  NS_DECL_ISUPPORTS
-  NS_DECL_IJSDEBUGGER
-
-  JSDebugger();
-
-private:
-  ~JSDebugger();
-};
-
-}
-}
-
-#endif

deleted file mode 100644
--- a/js/ductwork/debugger/Makefile.in
+++ /dev/null
@@ -1,75 +0,0 @@
-# ***** BEGIN LICENSE BLOCK *****
-# Version: MPL 1.1/GPL 2.0/LGPL 2.1
-#
-# The contents of this file are subject to the Mozilla Public License Version
-# 1.1 (the "License"); you may not use this file except in compliance with
-# the License. You may obtain a copy of the License at
-# http://www.mozilla.org/MPL/
-#
-# Software distributed under the License is distributed on an "AS IS" basis,
-# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
-# for the specific language governing rights and limitations under the
-# License.
-#
-# The Original Code is mozilla.org code.
-#
-# The Initial Developer of the Original Code is
-# The Mozilla Foundation <http://www.mozilla.org/>.
-# Portions created by the Initial Developer are Copyright (C) 2011
-# the Initial Developer. All Rights Reserved.
-#
-# Contributor(s):
-#  Dave Camp <dcamp@mozilla.com>
-#
-# Alternatively, the contents of this file may be used under the terms of
-# either the GNU General Public License Version 2 or later (the "GPL"), or
-# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
-# in which case the provisions of the GPL or the LGPL are applicable instead
-# of those above. If you wish to allow use of your version of this file only
-# under the terms of either the GPL or the LGPL, and not to allow others to
-# use your version of this file under the terms of the MPL, indicate your
-# decision by deleting the provisions above and replace them with the notice
-# and other provisions required by the GPL or the LGPL. If you do not delete
-# the provisions above, a recipient may use your version of this file under
-# the terms of any one of the MPL, the GPL or the LGPL.
-#
-# ***** END LICENSE BLOCK *****
-
-DEPTH = ../../..
-topsrcdir = @top_srcdir@
-srcdir = @srcdir@
-VPATH = @srcdir@
-relativesrcdir = js/ductwork/debugger
-
-include $(DEPTH)/config/autoconf.mk
-
-MODULE = jsdebugger
-MODULE_NAME = jsdebugger
-GRE_MODULE = 1
-
-LIBRARY_NAME = jsdebugger
-XPIDL_MODULE = jsdebugger
-LIBXUL_LIBRARY = 1
-EXPORT_LIBRARY = 1
-IS_COMPONENT = 1
-
-CPPSRCS = \
-  JSDebugger.cpp \
-  $(NULL)
-
-EXTRA_DSO_LDOPTS += \
-  $(MOZ_COMPONENT_LIBS) \
-  $(MOZ_JS_LIBS) \
-  $(NULL)
-
-EXTRA_JS_MODULES = \
-  jsdebugger.jsm \
-  $(NULL)
-
-XPIDLSRCS = \
-  IJSDebugger.idl \
-  $(NULL)
-
-XPCSHELL_TESTS = tests
-
-include $(topsrcdir)/config/rules.mk

deleted file mode 100644
--- a/js/ductwork/debugger/jsdebugger.jsm
+++ /dev/null
@@ -1,55 +0,0 @@
-/* -*-  Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2; -*- */
-/* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1/GPL 2.0/LGPL 2.1
- *
- * The contents of this file are subject to the Mozilla Public License Version
- * 1.1 (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- * http://www.mozilla.org/MPL/
- *
- * Software distributed under the License is distributed on an "AS IS" basis,
- * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
- * for the specific language governing rights and limitations under the
- * License.
- *
- * The Original Code is js-ctypes.
- *
- * The Initial Developer of the Original Code is
- * The Mozilla Foundation <http://www.mozilla.org/>.
- * Portions created by the Initial Developer are Copyright (C) 2011
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *  Jason Orendorff <jorendorff@mozilla.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either the GNU General Public License Version 2 or later (the "GPL"), or
- * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
- * in which case the provisions of the GPL or the LGPL are applicable instead
- * of those above. If you wish to allow use of your version of this file only
- * under the terms of either the GPL or the LGPL, and not to allow others to
- * use your version of this file under the terms of the MPL, indicate your
- * decision by deleting the provisions above and replace them with the notice
- * and other provisions required by the GPL or the LGPL. If you do not delete
- * the provisions above, a recipient may use your version of this file under
- * the terms of any one of the MPL, the GPL or the LGPL.
- *
- * ***** END LICENSE BLOCK ***** */
-
-let EXPORTED_SYMBOLS = [ "Debugger" ];
-
-/*
- * This is the js module for Debugger. Import it like so:
- *   Components.utils.import("resource://gre/modules/jsdebugger.jsm");
- *
- * This will create a 'Debugger' object, which provides an interface to debug
- * JavaScript code running in other compartments in the same process, on the
- * same thread.
- *
- * For documentation on the API, see:
- *   https://wiki.mozilla.org/Debugger
- */
-
-// Initialize the Debugger object. You do not need to do this yourself.
-const init = Components.classes["@mozilla.org/jsdebugger;1"].createInstance(Components.interfaces.IJSDebugger);
-init.addClass();

deleted file mode 100644
--- a/js/ductwork/debugger/tests/head_dbg.js
+++ /dev/null
@@ -1,17 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
-   http://creativecommons.org/publicdomain/zero/1.0/ */
-
-"use strict";
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-const Cu = Components.utils;
-const Cr = Components.results;
-
-function testGlobal(aName) {
-  let systemPrincipal = Cc["@mozilla.org/systemprincipal;1"]
-    .createInstance(Ci.nsIPrincipal);
-
-  let sandbox = Cu.Sandbox(systemPrincipal);
-  Cu.evalInSandbox("this.__name = '" + aName + "'", sandbox);
-  return sandbox;
-}

deleted file mode 100644
--- a/js/ductwork/debugger/tests/test_nativewrappers.js
+++ /dev/null
@@ -1,29 +0,0 @@
-function run_test()
-{
-  Components.utils.import("resource://gre/modules/jsdebugger.jsm");
-  var g = testGlobal("test1");
-
-  var dbg = new Debugger();
-  dbg.addDebuggee(g);
-  dbg.onDebuggerStatement = function(aFrame) {
-    let args = aFrame["arguments"];
-    try {
-      args[0];
-      do_check_true(true);
-    } catch(ex) {
-      do_check_true(false);
-    }
-  };
-
-  g.eval("function stopMe(arg) {debugger;}");
-
-  g2 = testGlobal("test2");
-  g2.g = g;
-  g2.eval("(" + function createBadEvent() {
-    let parser = Components.classes["@mozilla.org/xmlextras/domparser;1"].createInstance(Components.interfaces.nsIDOMParser);
-    let doc = parser.parseFromString("<foo></foo>", "text/xml");
-    g.stopMe(doc.createEvent("MouseEvent"));
-  } + ")()");
-
-  dbg.enabled = false;
-}

deleted file mode 100644
--- a/js/ductwork/debugger/tests/xpcshell.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[DEFAULT]
-head = head_dbg.js
-tail =
-
-[test_nativewrappers.js]

--- a/testing/xpcshell/xpcshell.ini
+++ b/testing/xpcshell/xpcshell.ini
@@ -41,17 +41,16 @@ skip-if = os == "android"
 [include:testing/xpcshell/example/unit/xpcshell.ini]
 [include:xpcom/tests/unit/xpcshell.ini]
 [include:modules/libpref/test/unit/xpcshell.ini]
 [include:intl/strres/tests/unit/xpcshell.ini]
 [include:intl/unicharutil/tests/unit/xpcshell.ini]
 [include:intl/uconv/tests/unit/xpcshell.ini]
 [include:netwerk/test/unit/xpcshell.ini]
 [include:netwerk/test/httpserver/test/xpcshell.ini]
-[include:js/ductwork/debugger/tests/xpcshell.ini]
 [include:js/jetpack/tests/unit/xpcshell.ini]
 [include:js/src/xpconnect/tests/unit/xpcshell.ini]
 [include:modules/libjar/test/unit/xpcshell.ini]
 [include:extensions/cookie/test/unit/xpcshell.ini]
 [include:storage/test/unit/xpcshell.ini]
 [include:rdf/tests/unit/xpcshell.ini]
 [include:gfx/tests/unit/xpcshell.ini]
 [include:widget/tests/unit/xpcshell.ini]

--- a/toolkit/library/libxul-config.mk
+++ b/toolkit/library/libxul-config.mk
@@ -137,17 +137,16 @@ COMPONENT_LIBS += \
 	toolkitcomps \
 	pipboot \
 	pipnss \
 	appcomps \
 	jsreflect \
 	composer \
 	jetpack_s \
 	telemetry \
-	jsdebugger \
 	storagecomps \
 	$(NULL)
 
 ifdef BUILD_CTYPES
 COMPONENT_LIBS += \
 	jsctypes \
 	$(NULL)
 endif

--- a/toolkit/library/nsStaticXULComponents.cpp
+++ b/toolkit/library/nsStaticXULComponents.cpp
@@ -268,17 +268,16 @@
     OSXPROXY_MODULE                          \
     WINDOWSPROXY_MODULE                      \
     JSCTYPES_MODULE                          \
     JSREFLECT_MODULE                         \
     MODULE(jsperf)                           \
     SERVICES_CRYPTO_MODULE                   \
     MOZ_APP_COMPONENT_MODULES                \
     MODULE(nsTelemetryModule)                \
-    MODULE(jsdebugger)                       \
     /* end of list */
 
 #define MODULE(_name) \
   NSMODULE_DECL(_name);
 
 XUL_MODULES
 
 #undef MODULE

--- a/toolkit/toolkit-makefiles.sh
+++ b/toolkit/toolkit-makefiles.sh
@@ -678,22 +678,16 @@ MAKEFILES_jsctypes="
   toolkit/components/ctypes/Makefile
   toolkit/components/ctypes/tests/Makefile
 "
 
 MAKEFILES_jsreflect="
   toolkit/components/reflect/Makefile
 "
 
-MAKEFILES_jsductwork="
-  js/ductwork/Makefile
-  js/ductwork/debugger/Makefile
-  js/ductwork/debugger/tests/Makefile
-"
-
 MAKEFILES_libpr0n="
   modules/libpr0n/Makefile
   modules/libpr0n/build/Makefile
   modules/libpr0n/public/Makefile
   modules/libpr0n/src/Makefile
   modules/libpr0n/decoders/Makefile
   modules/libpr0n/decoders/icon/Makefile
   modules/libpr0n/decoders/icon/mac/Makefile
@@ -751,17 +745,16 @@ add_makefiles "
   $MAKEFILES_gfx
   $MAKEFILES_htmlparser
   $MAKEFILES_intl
   $MAKEFILES_xpconnect
   $MAKEFILES_jsipc
   $MAKEFILES_jsdebugger
   $MAKEFILES_jsctypes
   $MAKEFILES_jsreflect
-  $MAKEFILES_jsductwork
   $MAKEFILES_content
   $MAKEFILES_layout
   $MAKEFILES_libimg
   $MAKEFILES_libjar
   $MAKEFILES_libreg
   $MAKEFILES_libpref
   $MAKEFILES_mathml
   $MAKEFILES_plugin

--- a/toolkit/toolkit-tiers.mk
+++ b/toolkit/toolkit-tiers.mk
@@ -219,18 +219,16 @@ endif
 ifdef MOZ_PREF_EXTENSIONS
 tier_platform_dirs += extensions/pref
 endif
 
 tier_platform_dirs += services/crypto/component
 
 tier_platform_dirs += startupcache
 
-tier_platform_dirs += js/ductwork
-
 ifdef APP_LIBXUL_STATICDIRS
 # Applications can cheat and ask for code to be
 # built before libxul so libxul can be linked against it.
 tier_platform_staticdirs += $(APP_LIBXUL_STATICDIRS)
 endif
 ifdef APP_LIBXUL_DIRS
 # Applications can cheat and ask for code to be
 # built before libxul so it can be linked into libxul.