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diff --git a/dom/base/nsNameSpaceManager.h b/dom/base/nsNameSpaceManager.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+#ifndef nsNameSpaceManager_h___
+#define nsNameSpaceManager_h___
+
+#include "nsTHashMap.h"
+#include "nsHashKeys.h"
+#include "nsAtom.h"
+#include "nsStringFwd.h"
+#include "nsTArray.h"
+
+#include "mozilla/StaticPtr.h"
+
+/**
+ * The Name Space Manager tracks the association between a NameSpace
+ * URI and the int32_t runtime id. Mappings between NameSpaces and
+ * NameSpace prefixes are managed by nsINameSpaces.
+ *
+ * All NameSpace URIs are stored in a global table so that IDs are
+ * consistent accross the app. NameSpace IDs are only consistent at runtime
+ * ie: they are not guaranteed to be consistent accross app sessions.
+ *
+ * The nsNameSpaceManager needs to have a live reference for as long as
+ * the NameSpace IDs are needed.
+ *
+ */
+
+class nsNameSpaceManager final {
+ public:
+  NS_INLINE_DECL_REFCOUNTING(nsNameSpaceManager)
+
+  nsresult RegisterNameSpace(const nsAString& aURI, int32_t& aNameSpaceID);
+  nsresult RegisterNameSpace(already_AddRefed<nsAtom> aURI,
+                             int32_t& aNameSpaceID);
+
+  nsresult GetNameSpaceURI(int32_t aNameSpaceID, nsAString& aURI);
+
+  // Returns the atom for the namespace URI associated with the given ID. The
+  // ID must be within range and not be kNameSpaceID_None (i.e. zero);
+  //
+  // NB: The requirement of mapping from the first entry to the empty atom is
+  // necessary for Servo, though it can be removed if needed adding a branch in
+  // GeckoElement::get_namespace().
+  nsAtom* NameSpaceURIAtom(int32_t aNameSpaceID) {
+    MOZ_ASSERT(aNameSpaceID > 0);
+    MOZ_ASSERT((int64_t)aNameSpaceID < (int64_t)mURIArray.Length());
+    return mURIArray.ElementAt(aNameSpaceID);
+  }
+
+  int32_t GetNameSpaceID(const nsAString& aURI, bool aInChromeDoc);
+  int32_t GetNameSpaceID(nsAtom* aURI, bool aInChromeDoc);
+
+  static const char* GetNameSpaceDisplayName(uint32_t aNameSpaceID);
+
+  bool HasElementCreator(int32_t aNameSpaceID);
+
+  static nsNameSpaceManager* GetInstance();
+  bool mMathMLDisabled;
+  bool mSVGDisabled;
+
+ private:
+  static void PrefChanged(const char* aPref, void* aSelf);
+  void PrefChanged(const char* aPref);
+
+  bool Init();
+  nsresult AddNameSpace(already_AddRefed<nsAtom> aURI,
+                        const int32_t aNameSpaceID);
+  nsresult AddDisabledNameSpace(already_AddRefed<nsAtom> aURI,
+                                const int32_t aNameSpaceID);
+  ~nsNameSpaceManager() = default;
+
+  nsTHashMap<nsRefPtrHashKey<nsAtom>, int32_t> mURIToIDTable;
+  nsTHashMap<nsRefPtrHashKey<nsAtom>, int32_t> mDisabledURIToIDTable;
+  nsTArray<RefPtr<nsAtom>> mURIArray;
+
+  static mozilla::StaticRefPtr<nsNameSpaceManager> sInstance;
+};
+
+#endif  // nsNameSpaceManager_h___