diff --git a/accessible/aom/AccessibleNode.h b/accessible/aom/AccessibleNode.h
index 001e94e92fe9..4b08c54849da 100644
--- a/accessible/aom/AccessibleNode.h
+++ b/accessible/aom/AccessibleNode.h
@@ -34,7 +34,7 @@ public:
   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);
diff --git a/dom/crypto/WebCryptoTask.h b/dom/crypto/WebCryptoTask.h
index bb109201783a..d3c389a6aa2b 100644
--- a/dom/crypto/WebCryptoTask.h
+++ b/dom/crypto/WebCryptoTask.h
@@ -179,9 +179,9 @@ protected:
 
   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;
diff --git a/widget/windows/nsWindowBase.h b/widget/windows/nsWindowBase.h
index 159c4fc00c7f..ca9acde85561 100644
--- a/widget/windows/nsWindowBase.h
+++ b/widget/windows/nsWindowBase.h
@@ -25,7 +25,7 @@ public:
   /*
    * Return the HWND or null for this widget.
    */
-  virtual HWND GetWindowHandle() final {
+  HWND GetWindowHandle() {
     return static_cast<HWND>(GetNativeData(NS_NATIVE_WINDOW));
   }