--- a/dom/interfaces/base/domstubs.idl
+++ b/dom/interfaces/base/domstubs.idl
@@ -70,17 +70,16 @@ interface nsIDOMCSSValue;
 interface nsIDOMCSSPrimitiveValue;
 interface nsIDOMCSSRule;
 interface nsIDOMCSSRuleList;
 interface nsIDOMMozCSSKeyframeRule;
 interface nsIDOMCSSStyleSheet;
 interface nsIDOMCSSStyleDeclaration;
 interface nsIDOMCounter;
 interface nsIDOMRect;
-interface nsIDOMRGBColor;
 interface nsIDOMCSSStyleRule;
 interface nsIDOMCSSStyleRuleCollection;
 interface nsIDOMHTMLTableCaptionElement;
 interface nsIDOMHTMLTableSectionElement;
 
 // Range
 interface nsIDOMRange;
 

--- a/dom/interfaces/css/Makefile.in
+++ b/dom/interfaces/css/Makefile.in
@@ -34,19 +34,17 @@ XPIDLSRCS =					\
 	nsIDOMCSSMozDocumentRule.idl		\
 	nsIDOMCSSSupportsRule.idl		\
 	nsIDOMMozCSSKeyframeRule.idl		\
 	nsIDOMMozCSSKeyframesRule.idl		\
 	nsIDOMCSSPageRule.idl			\
 	nsIDOMCSSStyleRule.idl			\
 	nsIDOMCSSUnknownRule.idl		\
 	nsIDOMCounter.idl			\
-	nsIDOMRGBColor.idl			\
 	nsIDOMRect.idl				\
-	nsIDOMNSRGBAColor.idl			\
 	$(NULL)
 
 include $(topsrcdir)/config/rules.mk
 
 XPIDL_FLAGS += \
   -I$(topsrcdir)/dom/interfaces/base \
   -I$(topsrcdir)/dom/interfaces/stylesheets \
   $(NULL)

deleted file mode 100644
--- a/dom/interfaces/css/nsIDOMNSRGBAColor.idl
+++ /dev/null
@@ -1,12 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "nsIDOMRGBColor.idl"
-
-[scriptable, uuid(742dc816-5134-4214-adfa-cad9dd3377cd)]
-interface nsIDOMNSRGBAColor : nsIDOMRGBColor
-{
-  readonly attribute nsIDOMCSSPrimitiveValue  alpha;
-};

deleted file mode 100644
--- a/dom/interfaces/css/nsIDOMRGBColor.idl
+++ /dev/null
@@ -1,14 +0,0 @@
-/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#include "domstubs.idl"
-
-[scriptable, uuid(6aff3102-320d-4986-9790-12316bb87cf9)]
-interface nsIDOMRGBColor : nsISupports
-{
-  readonly attribute nsIDOMCSSPrimitiveValue  red;
-  readonly attribute nsIDOMCSSPrimitiveValue  green;
-  readonly attribute nsIDOMCSSPrimitiveValue  blue;
-};

--- a/layout/style/nsDOMCSSRGBColor.cpp
+++ b/layout/style/nsDOMCSSRGBColor.cpp
@@ -27,60 +27,22 @@ nsDOMCSSRGBColor::nsDOMCSSRGBColor(nsROC
   SetIsDOMBinding();
 }
 
 nsDOMCSSRGBColor::~nsDOMCSSRGBColor(void)
 {
 }
 
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsDOMCSSRGBColor)
-  NS_INTERFACE_MAP_ENTRY(nsIDOMRGBColor)
-  NS_INTERFACE_MAP_ENTRY(nsIDOMNSRGBAColor)
   NS_INTERFACE_MAP_ENTRY(nsISupports)
   NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
 NS_INTERFACE_MAP_END
 
 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_4(nsDOMCSSRGBColor, mAlpha,  mBlue, mGreen, mRed)
 NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMCSSRGBColor)
 NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMCSSRGBColor)
 
 JSObject*
 nsDOMCSSRGBColor::WrapObject(JSContext *aCx, JSObject *aScope, bool *aTried)
 {
   return dom::RGBColorBinding::Wrap(aCx, aScope, this, aTried);
 }
 
-
-NS_IMETHODIMP
-nsDOMCSSRGBColor::GetRed(nsIDOMCSSPrimitiveValue** aRed)
-{
-  NS_ENSURE_TRUE(mRed, NS_ERROR_NOT_INITIALIZED);
-  *aRed = mRed;
-  NS_ADDREF(*aRed);
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDOMCSSRGBColor::GetGreen(nsIDOMCSSPrimitiveValue** aGreen)
-{
-  NS_ENSURE_TRUE(mGreen, NS_ERROR_NOT_INITIALIZED);
-  *aGreen = mGreen;
-  NS_ADDREF(*aGreen);
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDOMCSSRGBColor::GetBlue(nsIDOMCSSPrimitiveValue** aBlue)
-{
-  NS_ENSURE_TRUE(mBlue, NS_ERROR_NOT_INITIALIZED);
-  *aBlue = mBlue;
-  NS_ADDREF(*aBlue);
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDOMCSSRGBColor::GetAlpha(nsIDOMCSSPrimitiveValue** aAlpha)
-{
-  NS_ENSURE_TRUE(mAlpha, NS_ERROR_NOT_INITIALIZED);
-  *aAlpha = mAlpha;
-  NS_ADDREF(*aAlpha);
-  return NS_OK;
-}

--- a/layout/style/nsDOMCSSRGBColor.h
+++ b/layout/style/nsDOMCSSRGBColor.h
@@ -6,36 +6,33 @@
 /* DOM object representing color values in DOM computed style */
 
 #ifndef nsDOMCSSRGBColor_h__
 #define nsDOMCSSRGBColor_h__
 
 #include "mozilla/Attributes.h"
 #include "nsAutoPtr.h"
 #include "nsISupports.h"
-#include "nsIDOMNSRGBAColor.h"
 #include "nsWrapperCache.h"
 
 class nsROCSSPrimitiveValue;
 
-class nsDOMCSSRGBColor : public nsIDOMNSRGBAColor,
+class nsDOMCSSRGBColor : public nsISupports,
                          public nsWrapperCache
 {
 public:
   nsDOMCSSRGBColor(nsROCSSPrimitiveValue* aRed,
                    nsROCSSPrimitiveValue* aGreen,
                    nsROCSSPrimitiveValue* aBlue,
                    nsROCSSPrimitiveValue* aAlpha,
                    bool aHasAlpha);
 
   virtual ~nsDOMCSSRGBColor(void);
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS
-  NS_DECL_NSIDOMRGBCOLOR
-  NS_DECL_NSIDOMNSRGBACOLOR
 
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsDOMCSSRGBColor)
 
   bool HasAlpha() const { return mHasAlpha; }
 
   // RGBColor webidl interface
   nsROCSSPrimitiveValue* Red() const
   {