diff --git a/dom/ipc/TabParent.cpp b/dom/ipc/TabParent.cpp
index 2ec5abb49..a239b848d 100644
--- a/dom/ipc/TabParent.cpp
+++ b/dom/ipc/TabParent.cpp
@@ -383,10 +383,6 @@ TabParent::AddWindowListeners()
                                       this, false, false);
       }
     }
-    if (nsIPresShell* shell = mFrameElement->OwnerDoc()->GetShell()) {
-      mPresShellWithRefreshListener = shell;
-      shell->AddPostRefreshObserver(this);
-    }
   }
 }
 
@@ -401,18 +397,6 @@ TabParent::RemoveWindowListeners()
                                        this, false);
     }
   }
-  if (mPresShellWithRefreshListener) {
-    mPresShellWithRefreshListener->RemovePostRefreshObserver(this);
-    mPresShellWithRefreshListener = nullptr;
-  }
-}
-
-void
-TabParent::DidRefresh()
-{
-  if (mChromeOffset != -GetChildProcessOffset()) {
-    UpdatePosition();
-  }
 }
 
 void
diff --git a/dom/ipc/TabParent.h b/dom/ipc/TabParent.h
index 1bc1aeb0b..923504b42 100644
--- a/dom/ipc/TabParent.h
+++ b/dom/ipc/TabParent.h
@@ -85,7 +85,6 @@ class TabParent final : public PBrowserParent
                       , public nsISecureBrowserUI
                       , public nsSupportsWeakReference
                       , public TabContext
-                      , public nsAPostRefreshObserver
                       , public nsIWebBrowserPersistable
 {
     typedef mozilla::dom::ClonedMessageData ClonedMessageData;
@@ -145,7 +144,6 @@ public:
 
     void RemoveWindowListeners();
     void AddWindowListeners();
-    void DidRefresh() override;
 
     virtual bool RecvMoveFocus(const bool& aForward,
                                const bool& aForDocumentNavigation) override;
@@ -628,8 +626,6 @@ private:
     // cursor.  This happens whenever the cursor is in the tab's region.
     bool mTabSetsCursor;
 
-    RefPtr<nsIPresShell> mPresShellWithRefreshListener;
-
     bool mHasContentOpener;
 
     DebugOnly<int32_t> mActiveSupressDisplayportCount;