--- a/js/xpconnect/shell/xpcshell.cpp
+++ b/js/xpconnect/shell/xpcshell.cpp
@@ -1755,20 +1755,16 @@ main(int argc, char **argv, char **envp)
     nsresult rv;
 
 #ifdef HAVE_SETBUF
     // unbuffer stdout so that output is in the correct order; note that stderr
     // is unbuffered by default
     setbuf(stdout, 0);
 #endif
 
-#ifdef XRE_HAS_DLL_BLOCKLIST
-    XRE_SetupDllBlocklist();
-#endif
-
     gErrFile = stderr;
     gOutFile = stdout;
     gInFile = stdin;
 
     NS_LogInit();
 
     nsCOMPtr<nsILocalFile> appFile;
     rv = XRE_GetBinaryPath(argv[0], getter_AddRefs(appFile));

--- a/toolkit/xre/nsWindowsDllBlocklist.cpp
+++ b/toolkit/xre/nsWindowsDllBlocklist.cpp
@@ -45,17 +45,16 @@
 
 #ifdef XRE_WANT_DLL_BLOCKLIST
 #define XRE_SetupDllBlocklist SetupDllBlocklist
 #else
 #include "nsXULAppAPI.h"
 #endif
 
 #include "nsAutoPtr.h"
-#include "nsThreadUtils.h"
 
 #include "prlog.h"
 
 #include "nsWindowsDllInterceptor.h"
 
 #if defined(MOZ_CRASHREPORTER) && !defined(NO_BLOCKLIST_CRASHREPORTER)
 #include "nsExceptionHandler.h"
 #endif
@@ -147,86 +146,22 @@ static DllBlockInfo sWindowsDllBlocklist
 
 #ifndef STATUS_DLL_NOT_FOUND
 #define STATUS_DLL_NOT_FOUND ((DWORD)0xC0000135L)
 #endif
 
 // define this for very verbose dll load debug spew
 #undef DEBUG_very_verbose
 
-extern bool gInXPCOMLoadOnMainThread;
-
 namespace {
 
 typedef NTSTATUS (NTAPI *LdrLoadDll_func) (PWCHAR filePath, PULONG flags, PUNICODE_STRING moduleFileName, PHANDLE handle);
 
 static LdrLoadDll_func stub_LdrLoadDll = 0;
 
-template <class T>
-struct RVAMap {
-  RVAMap(HANDLE map, DWORD offset) {
-    SYSTEM_INFO info;
-    GetSystemInfo(&info);
-
-    DWORD alignedOffset = (offset / info.dwAllocationGranularity) *
-                          info.dwAllocationGranularity;
-
-    NS_ASSERTION(offset - alignedOffset < info.dwAllocationGranularity, "Wtf");
-
-    void* mRealView = ::MapViewOfFile(map, FILE_MAP_READ, 0, alignedOffset,
-                                      sizeof(T) + (offset - alignedOffset));
-
-    mMappedView = reinterpret_cast<T*>((char*)mRealView + (offset - alignedOffset));
-  }
-  ~RVAMap() {
-    if (mRealView) {
-      ::UnmapViewOfFile(mRealView);
-    }
-  }
-  operator const T*() const { return mMappedView; }
-  const T* operator->() const { return mMappedView; }
-private:
-  const T* mMappedView;
-  void* mRealView;
-};
-
-bool
-CheckASLR(const wchar_t* path)
-{
-  bool retval = false;
-
-  HANDLE file = ::CreateFileW(path, GENERIC_READ, FILE_SHARE_READ,
-                              NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL,
-                              NULL);
-  if (file != INVALID_HANDLE_VALUE) {
-    HANDLE map = ::CreateFileMappingW(file, NULL, PAGE_READONLY, 0, 0, NULL);
-    if (map) {
-      RVAMap<IMAGE_DOS_HEADER> peHeader(map, 0);
-      if (peHeader) {
-        RVAMap<IMAGE_NT_HEADERS> ntHeader(map, peHeader->e_lfanew);
-        if (ntHeader) {
-          // If the DLL has no code, permit it regardless of ASLR status.
-          if (ntHeader->OptionalHeader.SizeOfCode == 0) {
-            retval = true;
-          }
-          // Check to see if the DLL supports ASLR
-          else if ((ntHeader->OptionalHeader.DllCharacteristics &
-                    IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE) != 0) {
-            retval = true;
-          }
-        }
-      }
-      ::CloseHandle(map);
-    }
-    ::CloseHandle(file);
-  }
-
-  return retval;
-}
-
 /**
  * Some versions of Windows call LoadLibraryEx to get the version information
  * for a DLL, which causes our patched LdrLoadDll implementation to re-enter
  * itself and cause infinite recursion and a stack-exhaustion crash. We protect
  * against reentrancy by allowing recursive loads of the same DLL.
  *
  * Note that we don't use __declspec(thread) because that doesn't work in DLLs
  * loaded via LoadLibrary and there can be a limited number of TLS slots, so
@@ -285,39 +220,16 @@ patched_LdrLoadDll (PWCHAR filePath, PUL
 #define DLLNAME_MAX 128
   char dllName[DLLNAME_MAX+1];
   wchar_t *dll_part;
   DllBlockInfo *info;
 
   int len = moduleFileName->Length / 2;
   wchar_t *fname = moduleFileName->Buffer;
 
-  // In Windows 8, the first parameter seems to be used for more than just the
-  // path name.  For example, its numerical value can be 1.  Passing a non-valid
-  // pointer to SearchPathW will cause a crash, so we need to check to see if we
-  // are handed a valid pointer, and otherwise just pass NULL to SearchPathW.
-  PWCHAR sanitizedFilePath = (intptr_t(filePath) < 1024) ? NULL : filePath;
-
-  // figure out the length of the string that we need
-  DWORD pathlen = SearchPathW(sanitizedFilePath, fname, L".dll", 0, NULL, NULL);
-  if (pathlen == 0) {
-    // uh, we couldn't find the DLL at all, so...
-    printf_stderr("LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find it?)\n", dllName);
-    return STATUS_DLL_NOT_FOUND;
-  }
-
-  nsAutoArrayPtr<wchar_t> full_fname(new wchar_t[pathlen+1]);
-  if (!full_fname) {
-    // couldn't allocate memory?
-    return STATUS_DLL_NOT_FOUND;
-  }
-
-  // now actually grab it
-  SearchPathW(sanitizedFilePath, fname, L".dll", pathlen+1, full_fname, NULL);
-
   // The filename isn't guaranteed to be null terminated, but in practice
   // it always will be; ensure that this is so, and bail if not.
   // This is done instead of the more robust approach because of bug 527122,
   // where lots of weird things were happening when we tried to make a copy.
   if (moduleFileName->MaximumLength < moduleFileName->Length+2 ||
       fname[len] != 0)
   {
 #ifdef DEBUG
@@ -388,16 +300,39 @@ patched_LdrLoadDll (PWCHAR filePath, PUL
 #endif
 
     if (info->maxVersion != ALL_VERSIONS) {
       ReentrancySentinel sentinel(dllName);
       if (sentinel.BailOut()) {
         goto continue_loading;
       }
 
+      // In Windows 8, the first parameter seems to be used for more than just the
+      // path name.  For example, its numerical value can be 1.  Passing a non-valid
+      // pointer to SearchPathW will cause a crash, so we need to check to see if we
+      // are handed a valid pointer, and otherwise just pass NULL to SearchPathW.
+      PWCHAR sanitizedFilePath = (intptr_t(filePath) < 1024) ? NULL : filePath;
+
+      // figure out the length of the string that we need
+      DWORD pathlen = SearchPathW(sanitizedFilePath, fname, L".dll", 0, NULL, NULL);
+      if (pathlen == 0) {
+        // uh, we couldn't find the DLL at all, so...
+        printf_stderr("LdrLoadDll: Blocking load of '%s' (SearchPathW didn't find it?)\n", dllName);
+        return STATUS_DLL_NOT_FOUND;
+      }
+
+      wchar_t *full_fname = (wchar_t*) malloc(sizeof(wchar_t)*(pathlen+1));
+      if (!full_fname) {
+        // couldn't allocate memory?
+        return STATUS_DLL_NOT_FOUND;
+      }
+
+      // now actually grab it
+      SearchPathW(sanitizedFilePath, fname, L".dll", pathlen+1, full_fname, NULL);
+
       DWORD zero;
       DWORD infoSize = GetFileVersionInfoSizeW(full_fname, &zero);
 
       // If we failed to get the version information, we block.
 
       if (infoSize != 0) {
         nsAutoArrayPtr<unsigned char> infoData(new unsigned char[infoSize]);
         VS_FIXEDFILEINFO *vInfo;
@@ -411,39 +346,33 @@ patched_LdrLoadDll (PWCHAR filePath, PUL
             ((unsigned long long)vInfo->dwFileVersionLS);
 
           // finally do the version check, and if it's greater than our block
           // version, keep loading
           if (fVersion > info->maxVersion)
             load_ok = true;
         }
       }
+
+      free(full_fname);
     }
 
     if (!load_ok) {
       printf_stderr("LdrLoadDll: Blocking load of '%s' -- see http://www.mozilla.com/en-US/blocklist/\n", dllName);
       return STATUS_DLL_NOT_FOUND;
     }
   }
 
 continue_loading:
 #ifdef DEBUG_very_verbose
   printf_stderr("LdrLoadDll: continuing load... ('%S')\n", moduleFileName->Buffer);
 #endif
 
   NS_SetHasLoadedNewDLLs();
 
-  if (gInXPCOMLoadOnMainThread && NS_IsMainThread()) {
-    // Check to ensure that the DLL has ASLR.
-    if (!CheckASLR(full_fname)) {
-      printf_stderr("LdrLoadDll: Blocking load of '%s'.  XPCOM components must support ASLR.\n", dllName);
-      return STATUS_DLL_NOT_FOUND;
-    }
-  }
-
   return stub_LdrLoadDll(filePath, flags, moduleFileName, handle);
 }
 
 WindowsDllInterceptor NtDllIntercept;
 
 } // anonymous namespace
 
 void

--- a/xpcom/components/nsNativeComponentLoader.cpp
+++ b/xpcom/components/nsNativeComponentLoader.cpp
@@ -82,18 +82,16 @@
 #define IMPLEMENT_BREAK_AFTER_LOAD
 #endif
 
 using namespace mozilla;
 
 static PRLogModuleInfo *nsNativeModuleLoaderLog =
     PR_NewLogModule("nsNativeModuleLoader");
 
-bool gInXPCOMLoadOnMainThread = false;
-
 #define LOG(level, args) PR_LOG(nsNativeModuleLoaderLog, level, args)
 
 NS_IMPL_QUERY_INTERFACE1(nsNativeModuleLoader, 
                          mozilla::ModuleLoader)
 
 NS_IMPL_ADDREF_USING_AGGREGATOR(nsNativeModuleLoader,
                                 nsComponentManagerImpl::gComponentManager)
 NS_IMPL_RELEASE_USING_AGGREGATOR(nsNativeModuleLoader,
@@ -164,19 +162,17 @@ nsNativeModuleLoader::LoadModule(FileLoc
         LOG(PR_LOG_DEBUG,
             ("nsNativeModuleLoader::LoadModule(\"%s\") - found in cache",
              filePath.get()));
         return data.module;
     }
 
     // We haven't loaded this module before
 
-    gInXPCOMLoadOnMainThread = true;
     rv = file->Load(&data.library);
-    gInXPCOMLoadOnMainThread = false;
 
     if (NS_FAILED(rv)) {
         char errorMsg[1024] = "<unknown; can't get error from NSPR>";
 
         if (PR_GetErrorTextLength() < (int) sizeof(errorMsg))
             PR_GetErrorText(errorMsg);
 
         LogMessage("Failed to load native module at path '%s': (%lx) %s",

--- a/xpcom/tests/Makefile.in
+++ b/xpcom/tests/Makefile.in
@@ -40,22 +40,17 @@ topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 relativesrcdir = xpcom/tests
 
 include $(DEPTH)/config/autoconf.mk
 
 MODULE		= xpcom
 
-DIRS		= \
-  external \
-  component \
-  bug656331_component \
-  component_no_aslr \
-  $(NULL)
+DIRS		= external component bug656331_component
 
 ifeq ($(OS_ARCH),WINNT)
 DIRS		+= windows
 endif
 
 ifdef DEHYDRA_PATH
 DIRS += static-checker
 endif

deleted file mode 100644
--- a/xpcom/tests/component_no_aslr/Makefile.in
+++ /dev/null
@@ -1,81 +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
-# Netscape Communications Corporation.
-# Portions created by the Initial Developer are Copyright (C) 1998
-# the Initial Developer. All Rights Reserved.
-#
-# Contributor(s):
-#   Benjamin Smedberg <benjamin@smedbergs.us>
-#
-# Alternatively, the contents of this file may be used under the terms of
-# either of 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 $(DEPTH)/config/autoconf.mk
-
-LIBRARY_NAME	= testcompnoaslr
-IS_COMPONENT	= 1
-CPPSRCS	= TestComponent.cpp
-NO_DIST_INSTALL = 1
-FORCE_SHARED_LIB = 1
-
-include $(topsrcdir)/config/config.mk
-
-MANIFEST_FILE = testcompnoaslr.manifest
-
-EXTRA_DSO_LDOPTS = \
-		$(DIST)/lib/$(LIB_PREFIX)xpcomglue_s.$(LIB_SUFFIX) \
-		$(XPCOM_FROZEN_LDOPTS) \
-		$(NSPR_LIBS) \
-		$(NULL)
-
-# Need to link with CoreFoundation on Mac
-ifeq (cocoa,$(MOZ_WIDGET_TOOLKIT))
-EXTRA_DSO_LDOPTS += \
-		$(TK_LIBS) \
-		$(NULL)
-endif
-
-include $(topsrcdir)/config/rules.mk
-
-LDFLAGS := $(filter-out -DYNAMICBASE,$(LDFLAGS)) -DYNAMICBASE:NO
-
-DEFINES += -DLIBRARY_FILENAME="$(SHARED_LIBRARY)"
-
-unittestlocation = xpcom/tests/unit
-
-libs:: $(SHARED_LIBRARY)
-	$(INSTALL) $^ $(testxpcobjdir)/$(unittestlocation)
-
-libs:: $(MANIFEST_FILE)
-	$(PYTHON) $(topsrcdir)/config/Preprocessor.py $(DEFINES) $(ACDEFINES) $(XULPPFLAGS) $< > $(testxpcobjdir)/$(unittestlocation)/$(<F)

deleted file mode 100644
--- a/xpcom/tests/component_no_aslr/TestComponent.cpp
+++ /dev/null
@@ -1,65 +0,0 @@
-/* -*- Mode: C++; tab-width: 8; 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
- * Netscape Communications Corporation.
- * Portions created by the Initial Developer are Copyright (C) 1998
- * the Initial Developer. All Rights Reserved.
- *
- * Contributor(s):
- *   Suresh Duddu <dp@netscape.com>
- *
- * Alternatively, the contents of this file may be used under the terms of
- * either of 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 "mozilla/ModuleUtils.h"
-
-#define NS_TESTING_CID \
-{ 0x335fb596, 0xe52d, 0x418f, \
-  { 0xb0, 0x1c, 0x1b, 0xf1, 0x6c, 0xe5, 0xe7, 0xe4 } }
-
-NS_DEFINE_NAMED_CID(NS_TESTING_CID);
-
-static nsresult
-DummyConstructorFunc(nsISupports* aOuter, const nsIID& aIID, void** aResult)
-{
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
-static const mozilla::Module::CIDEntry kTestCIDs[] = {
-  { &kNS_TESTING_CID, false, NULL, DummyConstructorFunc },
-  { NULL }
-};
-
-static const mozilla::Module kTestModule = {
-  mozilla::Module::kVersion,
-  kTestCIDs
-};
-
-NSMODULE_DEFN(dummy) = &kTestModule;
-
-  

deleted file mode 100644
--- a/xpcom/tests/component_no_aslr/testcompnoaslr.manifest
+++ /dev/null
@@ -1,2 +0,0 @@
-#filter substitution
-binary-component @LIBRARY_FILENAME@

deleted file mode 100644
--- a/xpcom/tests/unit/test_comp_no_aslr.js
+++ /dev/null
@@ -1,10 +0,0 @@
-Components.utils.import("resource://gre/modules/XPCOMUtils.jsm");
-
-const Cc = Components.classes;
-const Ci = Components.interfaces;
-
-function run_test() {
-  let manifest = do_get_file('testcompnoaslr.manifest');
-  Components.manager.autoRegister(manifest);
-  do_check_false("{335fb596-e52d-418f-b01c-1bf16ce5e7e4}" in Components.classesByID);
-}

--- a/xpcom/tests/unit/xpcshell.ini
+++ b/xpcom/tests/unit/xpcshell.ini
@@ -37,10 +37,8 @@ skip-if = os == "win" # See bug: 676412
 [test_stringstream.js]
 [test_symlinks.js]
 # Bug 676998: test fails consistently on Android
 fail-if = os == "android"
 [test_systemInfo.js]
 # Bug 676998: test fails consistently on Android
 fail-if = os == "android"
 [test_versioncomparator.js]
-[test_comp_no_aslr.js]
-fail-if = os != "win"