diff --git a/mozilla/content/base/src/nsDocumentViewer.cpp b/mozilla/content/base/src/nsDocumentViewer.cpp
index 07911c9f144..291475c4f0c 100644
--- a/mozilla/content/base/src/nsDocumentViewer.cpp
+++ b/mozilla/content/base/src/nsDocumentViewer.cpp
@@ -3770,13 +3770,28 @@ DocumentViewerImpl::InstallNewPresentation()
 }
 
 //------------------------------------------------------------
+// This called ONLY when printing has completed and the DV
+// is being notified that it should get rid of the PrintEngine.
+//
+// BUT, if we are in Print Preview then we want to ignore the 
+// notification (we do not get rid of the PrintEngine)
+// 
+// One small caveat: 
+//   This IS called from two places in this module for cleaning
+//   up when an error occurred during the start up printing 
+//   and print preview
+//
 void
 DocumentViewerImpl::OnDonePrinting() 
 {
 #if defined(NS_PRINTING) && defined(NS_PRINT_PREVIEW)
   if (mPrintEngine) {
-    mPrintEngine->Destroy();
-    NS_RELEASE(mPrintEngine);
+    if (GetIsPrintPreview()) {
+      mPrintEngine->DestroyPrintingData();
+    } else {
+      mPrintEngine->Destroy();
+      NS_RELEASE(mPrintEngine);
+    }
   }
 #endif // NS_PRINTING && NS_PRINT_PREVIEW
 }
diff --git a/mozilla/content/base/src/nsPrintEngine.cpp b/mozilla/content/base/src/nsPrintEngine.cpp
index 6d6b9ca1cb7..79efdb74da6 100644
--- a/mozilla/content/base/src/nsPrintEngine.cpp
+++ b/mozilla/content/base/src/nsPrintEngine.cpp
@@ -316,6 +316,15 @@ void nsPrintEngine::Destroy()
 
 }
 
+//-------------------------------------------------------
+void nsPrintEngine::DestroyPrintingData()
+{
+  if (mPrt) {
+    delete mPrt;
+    mPrt = nsnull;
+  }
+}
+
 //---------------------------------------------------------------------------------
 //-- Section: Methods needed by the DocViewer
 //---------------------------------------------------------------------------------
@@ -2237,10 +2246,6 @@ nsresult nsPrintEngine::CleanupOnFailure(nsresult aResult, PRBool aIsPrinting)
     NS_RELEASE(mPagePrintTimer);
   }
   
-  //if (mPrt) {
-  //  delete mPrt;
-  //  mPrt = nsnull;
-  //}
   SetIsPrinting(PR_FALSE);
 
   /* cleanup done, let's fire-up an error dialog to notify the user
diff --git a/mozilla/content/base/src/nsPrintEngine.h b/mozilla/content/base/src/nsPrintEngine.h
index afc3095ba30..91a2cfb0639 100644
--- a/mozilla/content/base/src/nsPrintEngine.h
+++ b/mozilla/content/base/src/nsPrintEngine.h
@@ -107,9 +107,10 @@ public:
 
 
   nsPrintEngine();
-  ~nsPrintEngine(); // non-virtual
+  virtual ~nsPrintEngine();
 
   void Destroy();
+  void DestroyPrintingData();
 
   nsresult Initialize(nsIDocumentViewer*      aDocViewer, 
                       nsIDocumentViewerPrint* aDocViewerPrint, 
diff --git a/mozilla/layout/base/nsDocumentViewer.cpp b/mozilla/layout/base/nsDocumentViewer.cpp
index 07911c9f144..291475c4f0c 100644
--- a/mozilla/layout/base/nsDocumentViewer.cpp
+++ b/mozilla/layout/base/nsDocumentViewer.cpp
@@ -3770,13 +3770,28 @@ DocumentViewerImpl::InstallNewPresentation()
 }
 
 //------------------------------------------------------------
+// This called ONLY when printing has completed and the DV
+// is being notified that it should get rid of the PrintEngine.
+//
+// BUT, if we are in Print Preview then we want to ignore the 
+// notification (we do not get rid of the PrintEngine)
+// 
+// One small caveat: 
+//   This IS called from two places in this module for cleaning
+//   up when an error occurred during the start up printing 
+//   and print preview
+//
 void
 DocumentViewerImpl::OnDonePrinting() 
 {
 #if defined(NS_PRINTING) && defined(NS_PRINT_PREVIEW)
   if (mPrintEngine) {
-    mPrintEngine->Destroy();
-    NS_RELEASE(mPrintEngine);
+    if (GetIsPrintPreview()) {
+      mPrintEngine->DestroyPrintingData();
+    } else {
+      mPrintEngine->Destroy();
+      NS_RELEASE(mPrintEngine);
+    }
   }
 #endif // NS_PRINTING && NS_PRINT_PREVIEW
 }
diff --git a/mozilla/layout/printing/nsPrintEngine.cpp b/mozilla/layout/printing/nsPrintEngine.cpp
index 6d6b9ca1cb7..79efdb74da6 100644
--- a/mozilla/layout/printing/nsPrintEngine.cpp
+++ b/mozilla/layout/printing/nsPrintEngine.cpp
@@ -316,6 +316,15 @@ void nsPrintEngine::Destroy()
 
 }
 
+//-------------------------------------------------------
+void nsPrintEngine::DestroyPrintingData()
+{
+  if (mPrt) {
+    delete mPrt;
+    mPrt = nsnull;
+  }
+}
+
 //---------------------------------------------------------------------------------
 //-- Section: Methods needed by the DocViewer
 //---------------------------------------------------------------------------------
@@ -2237,10 +2246,6 @@ nsresult nsPrintEngine::CleanupOnFailure(nsresult aResult, PRBool aIsPrinting)
     NS_RELEASE(mPagePrintTimer);
   }
   
-  //if (mPrt) {
-  //  delete mPrt;
-  //  mPrt = nsnull;
-  //}
   SetIsPrinting(PR_FALSE);
 
   /* cleanup done, let's fire-up an error dialog to notify the user
diff --git a/mozilla/layout/printing/nsPrintEngine.h b/mozilla/layout/printing/nsPrintEngine.h
index afc3095ba30..91a2cfb0639 100644
--- a/mozilla/layout/printing/nsPrintEngine.h
+++ b/mozilla/layout/printing/nsPrintEngine.h
@@ -107,9 +107,10 @@ public:
 
 
   nsPrintEngine();
-  ~nsPrintEngine(); // non-virtual
+  virtual ~nsPrintEngine();
 
   void Destroy();
+  void DestroyPrintingData();
 
   nsresult Initialize(nsIDocumentViewer*      aDocViewer, 
                       nsIDocumentViewerPrint* aDocViewerPrint,