diff --git a/mozilla/extensions/cookie/nsCookie.cpp b/mozilla/extensions/cookie/nsCookie.cpp
index be9c2059b7a..31f0365a5f0 100644
--- a/mozilla/extensions/cookie/nsCookie.cpp
+++ b/mozilla/extensions/cookie/nsCookie.cpp
@@ -322,18 +322,17 @@ nsresult
 cookie_Put(nsOutputFileStream strm, const nsString& aLine)
 {
   /* allocate a buffer from the heap */
-  char * cp = new char[aLine.Length() + 1];
+  char * cp = aLine.ToNewCString();
   if (! cp) {
     return NS_ERROR_FAILURE;
   }
-  aLine.ToCString(cp, aLine.Length() + 1);
 
   /* output each character */
   char* p = cp;
   while (*p) {
     strm.put(*(p++));
   }
-  delete[] cp;
+  nsCRT::free(cp);
   return NS_OK;
 }
 
diff --git a/mozilla/extensions/wallet/src/wallet.cpp b/mozilla/extensions/wallet/src/wallet.cpp
index 48e043ef697..0ccf39f8506 100644
--- a/mozilla/extensions/wallet/src/wallet.cpp
+++ b/mozilla/extensions/wallet/src/wallet.cpp
@@ -1444,13 +1444,11 @@ PRInt32
 wallet_PutLine(nsOutputFileStream strm, const nsString& aLine, PRBool obscure)
 {
   /* allocate a buffer from the heap */
-  char * cp = new char[aLine.Length() + 1];
+  char * cp = aLine.ToNewCString();
   if (! cp) {
-    return NS_ERROR_OUT_OF_MEMORY;
+    return NS_ERROR_FAILURE;
   }
 
-  aLine.ToCString(cp, aLine.Length() + 1);
-
   /* output each character */
   char* p = cp;
   while (*p) {
@@ -1458,7 +1456,7 @@ wallet_PutLine(nsOutputFileStream strm, const nsString& aLine, PRBool obscure)
   }
   strm.put('\n'^(obscure ? Wallet_GetKey() : (char)0));
 
-  delete[] cp;
+  nsCRT::free(cp);
   return 0;
 }