diff --git a/mozilla/parser/htmlparser/src/Makefile.in b/mozilla/parser/htmlparser/src/Makefile.in
index 94facbfca1e..74ad47086b9 100644
--- a/mozilla/parser/htmlparser/src/Makefile.in
+++ b/mozilla/parser/htmlparser/src/Makefile.in
@@ -66,6 +66,10 @@ REQUIRES	= xpcom \
 		  nkcache \
 		  intl \
 		  xpconnect \
+		  layout \
+		  widget \
+		  caps \
+		  js \
 		  $(NULL)
 
 SHARED_LIBRARY_LIBS = \
diff --git a/mozilla/parser/htmlparser/src/nsExpatDriver.cpp b/mozilla/parser/htmlparser/src/nsExpatDriver.cpp
index fab4e1eaaff..f0507f40816 100644
--- a/mozilla/parser/htmlparser/src/nsExpatDriver.cpp
+++ b/mozilla/parser/htmlparser/src/nsExpatDriver.cpp
@@ -56,6 +56,9 @@
 #include "nsCRT.h"
 #include "nsIConsoleService.h"
 #include "nsIScriptError.h"
+#include "nsIContentPolicy.h"
+#include "nsContentPolicyUtils.h"
+#include "nsContentErrors.h"
 #include "nsXPCOMCIDInternal.h"
 #include "nsUnicharInputStream.h"
 
@@ -796,6 +799,24 @@ nsExpatDriver::OpenInputStreamFromExternalDTD(const PRUnichar* aFPIStr,
     localURI.swap(uri);
   }
 
+  nsCOMPtr<nsIContentSink> sink = do_QueryInterface(mSink);
+  nsCOMPtr<nsIDocument> doc;
+  if (sink)
+    doc = do_QueryInterface(sink->GetTarget());
+  PRInt16 shouldLoad = nsIContentPolicy::ACCEPT;
+  rv = NS_CheckContentLoadPolicy(nsIContentPolicy::TYPE_OTHER,
+                                uri,
+                                (doc ? doc->NodePrincipal() : nsnull),
+                                doc,
+                                EmptyCString(), //mime guess
+                                nsnull,         //extra
+                                &shouldLoad);
+  if (NS_FAILED(rv)) return rv;
+  if (NS_CP_REJECTED(shouldLoad)) {
+    // Disallowed by content policy
+    return NS_ERROR_CONTENT_BLOCKED;
+  }
+
   rv = NS_OpenURI(aStream, uri);
 
   nsCAutoString absURL;