diff --git a/content/xbl/src/nsXBLContentSink.cpp b/content/xbl/src/nsXBLContentSink.cpp
index c5592982c638..5f94506cd842 100644
--- a/content/xbl/src/nsXBLContentSink.cpp
+++ b/content/xbl/src/nsXBLContentSink.cpp
@@ -188,9 +188,9 @@ nsXBLContentSink::FlushText(PRBool aCreateTextNode,
 NS_IMETHODIMP 
 nsXBLContentSink::HandleStartElement(const PRUnichar *aName, 
                                      const PRUnichar **aAtts, 
-                                     const PRUint32 aAttsCount, 
-                                     const PRUint32 aIndex, 
-                                     const PRUint32 aLineNumber)
+                                     PRUint32 aAttsCount, 
+                                     PRUint32 aIndex, 
+                                     PRUint32 aLineNumber)
 {
   nsresult rv = nsXMLContentSink::HandleStartElement(aName,aAtts,aAttsCount,aIndex,aLineNumber);
   if (NS_FAILED(rv))
diff --git a/content/xml/document/src/nsXMLContentSink.cpp b/content/xml/document/src/nsXMLContentSink.cpp
index 1b995349b2d6..89b99f10f557 100644
--- a/content/xml/document/src/nsXMLContentSink.cpp
+++ b/content/xml/document/src/nsXMLContentSink.cpp
@@ -1177,9 +1177,9 @@ nsXMLContentSink::GetElementFactory(PRInt32 aNameSpaceID,
 NS_IMETHODIMP 
 nsXMLContentSink::HandleStartElement(const PRUnichar *aName, 
                                      const PRUnichar **aAtts, 
-                                     const PRUint32 aAttsCount, 
-                                     const PRUint32 aIndex, 
-                                     const PRUint32 aLineNumber)
+                                     PRUint32 aAttsCount, 
+                                     PRUint32 aIndex, 
+                                     PRUint32 aLineNumber)
 {
   nsresult result = NS_OK;
   PRBool isHTML = PR_FALSE;
diff --git a/content/xul/document/src/nsXULContentSink.cpp b/content/xul/document/src/nsXULContentSink.cpp
index 8a68c08dd089..0b1285e8866e 100644
--- a/content/xul/document/src/nsXULContentSink.cpp
+++ b/content/xul/document/src/nsXULContentSink.cpp
@@ -862,9 +862,9 @@ NS_NewXULContentSink(nsIXULContentSink** aResult)
 NS_IMETHODIMP 
 XULContentSinkImpl::HandleStartElement(const PRUnichar *aName, 
                                        const PRUnichar **aAtts,
-                                       const PRUint32 aAttsCount, 
-                                       const PRUint32 aIndex, 
-                                       const PRUint32 aLineNumber)
+                                       PRUint32 aAttsCount, 
+                                       PRUint32 aIndex, 
+                                       PRUint32 aLineNumber)
 { 
   // XXX Hopefully the parser will flag this before we get here. If
   // we're in the epilog, there should be no new elements
diff --git a/htmlparser/public/nsIExpatSink.idl b/htmlparser/public/nsIExpatSink.idl
index f4287da67a84..8d1b24360ac8 100644
--- a/htmlparser/public/nsIExpatSink.idl
+++ b/htmlparser/public/nsIExpatSink.idl
@@ -41,27 +41,27 @@
 [scriptable, uuid(1DEEA160-C661-11d5-84CC-0010A4E0C706)]
 interface nsIExpatSink : nsISupports 
 {
-  void HandleStartElement([const] in wstring aName,
+  void HandleStartElement(in wstring aName,
                           [array, size_is (aAttsCount)] in wstring aAtts,
-						  [const] in unsigned long aAttsCount,
-						  [const] in unsigned long aIndex,
-						  [const] in unsigned long aLineNumber);
+                          in unsigned long aAttsCount,
+                          in unsigned long aIndex,
+                          in unsigned long aLineNumber);
 
-  void HandleEndElement([const] in wstring aName);
+  void HandleEndElement(in wstring aName);
   
-  void HandleComment([const] in wstring aName);
+  void HandleComment(in wstring aName);
       
-  void HandleCDataSection([const] in wstring aData, 
-                          [const] in unsigned long aLength);
+  void HandleCDataSection(in wstring aData, 
+                          in unsigned long aLength);
   
-  void HandleDoctypeDecl([const] in wstring aDoctype);
+  void HandleDoctypeDecl(in wstring aDoctype);
 
-  void HandleCharacterData([const] in wstring aData, 
-                           [const] in unsigned long aLength);
+  void HandleCharacterData(in wstring aData, 
+                           in unsigned long aLength);
 
-  void HandleProcessingInstruction([const] in wstring aTarget, 
-                                   [const] in wstring aData);
+  void HandleProcessingInstruction(in wstring aTarget, 
+                                   in wstring aData);
 
-  void ReportError([const] in wstring aErrorText,
-                   [const] in wstring aSourceText);
+  void ReportError(in wstring aErrorText,
+                   in wstring aSourceText);
 }; 
diff --git a/parser/htmlparser/public/nsIExpatSink.idl b/parser/htmlparser/public/nsIExpatSink.idl
index f4287da67a84..8d1b24360ac8 100644
--- a/parser/htmlparser/public/nsIExpatSink.idl
+++ b/parser/htmlparser/public/nsIExpatSink.idl
@@ -41,27 +41,27 @@
 [scriptable, uuid(1DEEA160-C661-11d5-84CC-0010A4E0C706)]
 interface nsIExpatSink : nsISupports 
 {
-  void HandleStartElement([const] in wstring aName,
+  void HandleStartElement(in wstring aName,
                           [array, size_is (aAttsCount)] in wstring aAtts,
-						  [const] in unsigned long aAttsCount,
-						  [const] in unsigned long aIndex,
-						  [const] in unsigned long aLineNumber);
+                          in unsigned long aAttsCount,
+                          in unsigned long aIndex,
+                          in unsigned long aLineNumber);
 
-  void HandleEndElement([const] in wstring aName);
+  void HandleEndElement(in wstring aName);
   
-  void HandleComment([const] in wstring aName);
+  void HandleComment(in wstring aName);
       
-  void HandleCDataSection([const] in wstring aData, 
-                          [const] in unsigned long aLength);
+  void HandleCDataSection(in wstring aData, 
+                          in unsigned long aLength);
   
-  void HandleDoctypeDecl([const] in wstring aDoctype);
+  void HandleDoctypeDecl(in wstring aDoctype);
 
-  void HandleCharacterData([const] in wstring aData, 
-                           [const] in unsigned long aLength);
+  void HandleCharacterData(in wstring aData, 
+                           in unsigned long aLength);
 
-  void HandleProcessingInstruction([const] in wstring aTarget, 
-                                   [const] in wstring aData);
+  void HandleProcessingInstruction(in wstring aTarget, 
+                                   in wstring aData);
 
-  void ReportError([const] in wstring aErrorText,
-                   [const] in wstring aSourceText);
+  void ReportError(in wstring aErrorText,
+                   in wstring aSourceText);
 }; 
diff --git a/rdf/base/src/nsRDFContentSink.cpp b/rdf/base/src/nsRDFContentSink.cpp
index 66189d86516f..62cde55b4cb5 100644
--- a/rdf/base/src/nsRDFContentSink.cpp
+++ b/rdf/base/src/nsRDFContentSink.cpp
@@ -627,7 +627,7 @@ RDFContentSinkImpl::HandleProcessingInstruction(const PRUnichar *aTarget,
 
 NS_IMETHODIMP
 RDFContentSinkImpl::ReportError(const PRUnichar* aErrorText, 
-                              const PRUnichar* aSourceText)
+                                const PRUnichar* aSourceText)
 {
   return NS_OK;
 }