diff --git a/toolkit/library/nsDllMain.cpp b/toolkit/library/nsDllMain.cpp
index 5f677aeb33e3..5380854bcde4 100644
--- a/toolkit/library/nsDllMain.cpp
+++ b/toolkit/library/nsDllMain.cpp
@@ -40,10 +40,6 @@
 #include <windows.h>
 #include "nsToolkit.h"
 
-#ifdef MOZ_ENABLE_LIBXUL
-#include "../xre/nsWindowsDllBlocklist.cpp"
-#endif
-
 #if defined(__GNUC__)
 // If DllMain gets name mangled, it won't be seen.
 extern "C" {
@@ -60,9 +56,6 @@ BOOL APIENTRY DllMain(
 {
     switch( reason ) {
         case DLL_PROCESS_ATTACH:
-#ifdef MOZ_ENABLE_LIBXUL
-            SetupDllBlocklist();
-#endif
             nsToolkit::Startup((HINSTANCE)hModule);
             break;
 
diff --git a/toolkit/xre/nsWindowsDllBlocklist.cpp b/toolkit/xre/nsWindowsDllBlocklist.cpp
index b37301d26ae6..07b76aea82dc 100644
--- a/toolkit/xre/nsWindowsDllBlocklist.cpp
+++ b/toolkit/xre/nsWindowsDllBlocklist.cpp
@@ -40,7 +40,6 @@
 #include <winternl.h>
 
 #include <stdio.h>
-#include <string.h>
 
 #include "nsAutoPtr.h"
 
@@ -58,31 +57,6 @@
 // define this for very verbose dll load debug spew
 #undef DEBUG_very_verbose
 
-// This class takes care of setting and restoring the current directory
-// to make sure that the process current directory is not searched when
-// loading DLLs.
-class CurrentDirectoryGuard {
-public:
-  CurrentDirectoryGuard() {
-    ::GetCurrentDirectoryW(MAX_PATH, mCwd);
-
-    WCHAR appPath[MAX_PATH] = {L'\0'};
-    ::GetModuleFileNameW(NULL, appPath, MAX_PATH);
-    LPWSTR lastBackslash = wcsrchr(appPath, L'\\');
-    if (lastBackslash) {
-      *lastBackslash = L'\0';
-    }
-    ::SetCurrentDirectoryW(appPath);
-  }
-
-  ~CurrentDirectoryGuard() {
-    ::SetCurrentDirectoryW(mCwd);
-  }
-
-private:
-  WCHAR mCwd[MAX_PATH];
-};
-
 // The signature for LdrLoadDll changed at some point, with the second arg
 // becoming a PULONG instead of a ULONG.  This should only matter on 64-bit
 // systems, for which there was no support earlier -- on 32-bit systems,
@@ -235,14 +209,6 @@ continue_loading:
 
   NS_SetHasLoadedNewDLLs();
 
-  // We need to make sure that the OS implementation of LdrLoadDll does not attempt
-  // to load any DLLs from the current working directory.  That's almost never what
-  // we want, and it can cause us load unexpected DLLs.  This guard protects against
-  // that by setting the current directory to the application's directory before
-  // LdrLoadDll is called, and restoring it to the original value when that call
-  // returns.
-  CurrentDirectoryGuard cwdGuard;
-
   return stub_LdrLoadDll(filePath, flags, moduleFileName, handle);
 }
 
diff --git a/toolkit/xre/nsWindowsWMain.cpp b/toolkit/xre/nsWindowsWMain.cpp
index b466f4f3b72b..7f81c22580df 100644
--- a/toolkit/xre/nsWindowsWMain.cpp
+++ b/toolkit/xre/nsWindowsWMain.cpp
@@ -8,8 +8,7 @@
 
 #include "nsUTF8Utils.h"
 
-#if defined(_MSC_VER) && defined(_M_IX86) && defined(XRE_WANT_DLL_BLOCKLIST) \
-   !defined(MOZ_ENABLE_LIBXUL)
+#if defined(_MSC_VER) && defined(_M_IX86) && defined(XRE_WANT_DLL_BLOCKLIST)
 #include "nsWindowsDllBlocklist.cpp"
 #else
 #undef XRE_WANT_DLL_BLOCKLIST