diff --git a/content/xslt/src/base/txURIUtils.cpp b/content/xslt/src/base/txURIUtils.cpp
index 57730eda1df4..c3198634fb50 100644
--- a/content/xslt/src/base/txURIUtils.cpp
+++ b/content/xslt/src/base/txURIUtils.cpp
@@ -207,6 +207,7 @@ void
 URIUtils::ResetWithSource(nsIDocument *aNewDoc, nsIDOMNode *aSourceNode)
 {
     if (!aSourceNode) {
+        // XXXbz passing nsnull as the first arg to Reset is illegal
         aNewDoc->Reset(nsnull, nsnull);
         return;
     }
@@ -219,13 +220,31 @@ URIUtils::ResetWithSource(nsIDocument *aNewDoc, nsIDOMNode *aSourceNode)
     }
     if (!sourceDoc) {
         NS_ASSERTION(0, "no source document found");
+        // XXXbz passing nsnull as the first arg to Reset is illegal
         aNewDoc->Reset(nsnull, nsnull);
         return;
     }
 
+    nsIPrincipal* sourcePrincipal = sourceDoc->GetPrincipal();
+    if (!sourcePrincipal) {
+        return;
+    }
+
     // Copy the channel and loadgroup from the source document.
     nsCOMPtr<nsILoadGroup> loadGroup = sourceDoc->GetDocumentLoadGroup();
-    aNewDoc->Reset(sourceDoc->GetChannel(), loadGroup);
+    nsCOMPtr<nsIChannel> channel = sourceDoc->GetChannel();
+    if (!channel) {
+        // Need to synthesize one
+        if (NS_FAILED(NS_NewChannel(getter_AddRefs(channel),
+                                    sourceDoc->GetDocumentURI(),
+                                    nsnull,
+                                    loadGroup))) {
+            return;
+        }
+        channel->SetOwner(sourcePrincipal);
+    }
+    aNewDoc->Reset(channel, loadGroup);
+    aNewDoc->SetPrincipal(sourcePrincipal);
     aNewDoc->SetBaseURI(sourceDoc->GetBaseURI());
 
     // Copy charset
diff --git a/content/xslt/src/xslt/txMozillaTextOutput.cpp b/content/xslt/src/xslt/txMozillaTextOutput.cpp
index e7b9ed164b8d..e40eff2f9901 100644
--- a/content/xslt/src/xslt/txMozillaTextOutput.cpp
+++ b/content/xslt/src/xslt/txMozillaTextOutput.cpp
@@ -50,6 +50,7 @@
 #include "nsIDOMNSDocument.h"
 #include "nsIParser.h"
 #include "nsICharsetAlias.h"
+#include "nsIPrincipal.h"
 
 static NS_DEFINE_CID(kXMLDocumentCID, NS_XMLDOCUMENT_CID);
 
@@ -173,9 +174,26 @@ void txMozillaTextOutput::createResultDocument(nsIDOMDocument* aSourceDocument,
 
     // Reset and set up document
     nsCOMPtr<nsIDocument> sourceDoc = do_QueryInterface(aSourceDocument);
+    nsIPrincipal* sourcePrincipal = sourceDoc->GetPrincipal();
+    if (!sourcePrincipal) {
+        return;
+    }
+
     nsCOMPtr<nsILoadGroup> loadGroup = sourceDoc->GetDocumentLoadGroup();
+    nsCOMPtr<nsIChannel> channel = sourceDoc->GetChannel();
+    if (!channel) {
+        // Need to synthesize one
+        if (NS_FAILED(NS_NewChannel(getter_AddRefs(channel),
+                                    sourceDoc->GetDocumentURI(),
+                                    nsnull,
+                                    loadGroup))) {
+            return;
+        }
+        channel->SetOwner(sourcePrincipal);
+    }
     // Copy the channel and loadgroup from the source document.
-    doc->Reset(sourceDoc->GetChannel(), loadGroup);
+    doc->Reset(channel, loadGroup);
+    doc->SetPrincipal(sourcePrincipal);
     doc->SetBaseURI(sourceDoc->GetBaseURI());
 
     // Set the charset