diff --git a/string/obsolete/nsStr.h b/string/obsolete/nsStr.h
index 8757ce92f85..0802f394325 100644
--- a/string/obsolete/nsStr.h
+++ b/string/obsolete/nsStr.h
@@ -43,6 +43,7 @@
 #define _nsStr
 
 #include "nscore.h"
+#include "nsCppSharedAllocator.h"
 
 //----------------------------------------------------------------------------------------
 
@@ -311,7 +312,11 @@ public:
 	  
     aDest.mCapacity=theNewCapacity++;
     size_t theSize=(theNewCapacity<<aDest.mCharSize);
-    aDest.mStr=new char[theSize];
+
+    // aDest.mStr=new char[theSize];
+		nsCppSharedAllocator<char> shared_allocator;
+		aDest.mStr = shared_allocator.allocate(theSize);
+
     aDest.mOwnsBuffer=1;
     return PR_TRUE;
   }
@@ -319,7 +324,9 @@ public:
   virtual PRBool Free(nsStr& aDest){
     if(aDest.mStr){
       if(aDest.mOwnsBuffer){
-        delete [] aDest.mStr;
+        // delete [] aDest.mStr;
+        nsCppSharedAllocator<char> shared_allocator;
+        shared_allocator.deallocate(aDest.mStr, aDest.mCapacity);
       }
       aDest.mStr=0;
       aDest.mOwnsBuffer=0;
diff --git a/xpcom/ds/nsCRT.cpp b/xpcom/ds/nsCRT.cpp
index 1dad15e3b19..1149cc905d8 100644
--- a/xpcom/ds/nsCRT.cpp
+++ b/xpcom/ds/nsCRT.cpp
@@ -485,7 +485,12 @@ PRInt32 nsCRT::strncasecmp(const PRUnichar* s1, const char* s2, PRUint32 n)
 PRUnichar* nsCRT::strdup(const PRUnichar* str)
 {
   PRUint32 len = nsCRT::strlen(str) + 1; // add one for null
-  PRUnichar* rslt = new PRUnichar[len];
+
+
+	nsCppSharedAllocator<PRUnichar> shared_allocator;
+	PRUnichar* rslt = shared_allocator.allocate(len);
+  // PRUnichar* rslt = new PRUnichar[len];
+
   if (rslt == NULL) return NULL;
   nsCRT::memcpy(rslt, str, len * sizeof(PRUnichar));
   return rslt;
diff --git a/xpcom/ds/nsCRT.h b/xpcom/ds/nsCRT.h
index c44a5665f83..3dc6b4e510b 100644
--- a/xpcom/ds/nsCRT.h
+++ b/xpcom/ds/nsCRT.h
@@ -23,6 +23,7 @@
 #include "plstr.h"
 #include "nscore.h"
 #include "prtypes.h"
+#include "nsCppSharedAllocator.h"
 
 #define CR '\015'
 #define LF '\012'
@@ -201,7 +202,8 @@ public:
   static PRUnichar* strdup(const PRUnichar* str);
 
   static void free(PRUnichar* str) {
-    delete[] str;
+  	nsCppSharedAllocator<PRUnichar> shared_allocator;
+  	shared_allocator.deallocate(str, 0 /*we never new or kept the size*/);
   }
 
   /// Compute a hashcode for a C string
diff --git a/xpcom/ds/nsStr.h b/xpcom/ds/nsStr.h
index 8757ce92f85..0802f394325 100644
--- a/xpcom/ds/nsStr.h
+++ b/xpcom/ds/nsStr.h
@@ -43,6 +43,7 @@
 #define _nsStr
 
 #include "nscore.h"
+#include "nsCppSharedAllocator.h"
 
 //----------------------------------------------------------------------------------------
 
@@ -311,7 +312,11 @@ public:
 	  
     aDest.mCapacity=theNewCapacity++;
     size_t theSize=(theNewCapacity<<aDest.mCharSize);
-    aDest.mStr=new char[theSize];
+
+    // aDest.mStr=new char[theSize];
+		nsCppSharedAllocator<char> shared_allocator;
+		aDest.mStr = shared_allocator.allocate(theSize);
+
     aDest.mOwnsBuffer=1;
     return PR_TRUE;
   }
@@ -319,7 +324,9 @@ public:
   virtual PRBool Free(nsStr& aDest){
     if(aDest.mStr){
       if(aDest.mOwnsBuffer){
-        delete [] aDest.mStr;
+        // delete [] aDest.mStr;
+        nsCppSharedAllocator<char> shared_allocator;
+        shared_allocator.deallocate(aDest.mStr, aDest.mCapacity);
       }
       aDest.mStr=0;
       aDest.mOwnsBuffer=0;
diff --git a/xpcom/string/obsolete/nsStr.h b/xpcom/string/obsolete/nsStr.h
index 8757ce92f85..0802f394325 100644
--- a/xpcom/string/obsolete/nsStr.h
+++ b/xpcom/string/obsolete/nsStr.h
@@ -43,6 +43,7 @@
 #define _nsStr
 
 #include "nscore.h"
+#include "nsCppSharedAllocator.h"
 
 //----------------------------------------------------------------------------------------
 
@@ -311,7 +312,11 @@ public:
 	  
     aDest.mCapacity=theNewCapacity++;
     size_t theSize=(theNewCapacity<<aDest.mCharSize);
-    aDest.mStr=new char[theSize];
+
+    // aDest.mStr=new char[theSize];
+		nsCppSharedAllocator<char> shared_allocator;
+		aDest.mStr = shared_allocator.allocate(theSize);
+
     aDest.mOwnsBuffer=1;
     return PR_TRUE;
   }
@@ -319,7 +324,9 @@ public:
   virtual PRBool Free(nsStr& aDest){
     if(aDest.mStr){
       if(aDest.mOwnsBuffer){
-        delete [] aDest.mStr;
+        // delete [] aDest.mStr;
+        nsCppSharedAllocator<char> shared_allocator;
+        shared_allocator.deallocate(aDest.mStr, aDest.mCapacity);
       }
       aDest.mStr=0;
       aDest.mOwnsBuffer=0;