--- a/accessible/aom/AccessibleNode.h
+++ b/accessible/aom/AccessibleNode.h
@@ -29,17 +29,17 @@ class AccessibleNode : public nsISupport
 {
 public:
   explicit AccessibleNode(nsINode* aNode);
 
   NS_DECL_CYCLE_COLLECTING_ISUPPORTS;
   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(AccessibleNode);
 
   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
-  virtual dom::ParentObject GetParentObject() const final;
+  dom::ParentObject GetParentObject() const;
 
   void GetRole(nsAString& aRole);
   void GetStates(nsTArray<nsString>& aStates);
   void GetAttributes(nsTArray<nsString>& aAttributes);
   nsINode* GetDOMNode();
 
   bool Is(const Sequence<nsString>& aFlavors);
   bool Has(const Sequence<nsString>& aAttributes);

--- a/dom/crypto/WebCryptoTask.h
+++ b/dom/crypto/WebCryptoTask.h
@@ -174,19 +174,19 @@ protected:
   virtual nsresult BeforeCrypto() { return NS_OK; }
   virtual nsresult DoCrypto() { return NS_OK; }
   virtual nsresult AfterCrypto() { return NS_OK; }
   virtual void Resolve() {}
   virtual void Cleanup() {}
 
   void FailWithError(nsresult aRv);
 
-  virtual nsresult CalculateResult() final;
+  nsresult CalculateResult();
 
-  virtual void CallCallback(nsresult rv) final;
+  void CallCallback(nsresult rv);
 
 private:
   NS_IMETHOD Run() final;
   nsresult Cancel() final;
 
   class InternalWorkerHolder;
 
   nsCOMPtr<nsISerialEventTarget> mOriginalEventTarget;

--- a/widget/windows/nsWindowBase.h
+++ b/widget/windows/nsWindowBase.h
@@ -20,17 +20,17 @@
 class nsWindowBase : public nsBaseWidget
 {
 public:
   typedef mozilla::WidgetEventTime WidgetEventTime;
 
   /*
    * Return the HWND or null for this widget.
    */
-  virtual HWND GetWindowHandle() final {
+  HWND GetWindowHandle() {
     return static_cast<HWND>(GetNativeData(NS_NATIVE_WINDOW));
   }
 
   /*
    * Return the parent window, if it exists.
    */
   virtual nsWindowBase* GetParentWindowBase(bool aIncludeOwner) = 0;