diff --git a/docshell/base/BrowsingContextWebProgress.cpp b/docshell/base/BrowsingContextWebProgress.cpp
index 334ecfe629c0..9f364a9ee250 100644
--- a/docshell/base/BrowsingContextWebProgress.cpp
+++ b/docshell/base/BrowsingContextWebProgress.cpp
@@ -47,16 +47,6 @@ NS_IMETHODIMP BrowsingContextWebProgress::GetDOMWindow(
   return NS_ERROR_NOT_AVAILABLE;
 }
 
-NS_IMETHODIMP BrowsingContextWebProgress::GetDOMWindowID(
-    uint64_t* aDOMWindowID) {
-  return NS_ERROR_NOT_AVAILABLE;
-}
-
-NS_IMETHODIMP BrowsingContextWebProgress::GetInnerDOMWindowID(
-    uint64_t* aInnerDOMWindowID) {
-  return NS_ERROR_NOT_AVAILABLE;
-}
-
 NS_IMETHODIMP BrowsingContextWebProgress::GetIsTopLevel(bool* aIsTopLevel) {
   *aIsTopLevel = true;
   return NS_OK;
diff --git a/dom/ipc/BrowserChild.cpp b/dom/ipc/BrowserChild.cpp
index ba049f68d1a0..6a9f498d6edd 100644
--- a/dom/ipc/BrowserChild.cpp
+++ b/dom/ipc/BrowserChild.cpp
@@ -3748,16 +3748,19 @@ nsresult BrowserChild::PrepareProgressListenerData(
     NS_ENSURE_SUCCESS(rv, rv);
     aWebProgressData->loadType() = loadType;
 
-    uint64_t outerDOMWindowID = 0;
-    uint64_t innerDOMWindowID = 0;
     // The DOM Window ID getters here may throw if the inner or outer windows
     // aren't created yet or are destroyed at the time we're making this call
     // but that isn't fatal so ignore the exceptions here.
-    Unused << aWebProgress->GetDOMWindowID(&outerDOMWindowID);
-    aWebProgressData->outerDOMWindowID() = outerDOMWindowID;
-
-    Unused << aWebProgress->GetInnerDOMWindowID(&innerDOMWindowID);
-    aWebProgressData->innerDOMWindowID() = innerDOMWindowID;
+    nsCOMPtr<mozIDOMWindowProxy> window;
+    rv = aWebProgress->GetDOMWindow(getter_AddRefs(window));
+    if (NS_SUCCEEDED(rv) && window) {
+      if (nsCOMPtr<nsPIDOMWindowOuter> outer =
+              nsPIDOMWindowOuter::From(window)) {
+        if (nsPIDOMWindowInner* inner = outer->GetCurrentInnerWindow()) {
+          aWebProgressData->innerDOMWindowID() = inner->WindowID();
+        }
+      }
+    }
   }
 
   nsCOMPtr<nsIChannel> channel = do_QueryInterface(aRequest);
diff --git a/dom/ipc/BrowserParent.cpp b/dom/ipc/BrowserParent.cpp
index 2c922ff0551e..01690d5f8a38 100644
--- a/dom/ipc/BrowserParent.cpp
+++ b/dom/ipc/BrowserParent.cpp
@@ -2868,12 +2868,11 @@ void BrowserParent::ReconstructWebProgressAndRequest(
 
   nsCOMPtr<nsIWebProgress> webProgress;
   if (aWebProgressData) {
-    webProgress = new RemoteWebProgress(
-        aManager, aWebProgressData->outerDOMWindowID(),
-        aWebProgressData->innerDOMWindowID(), aWebProgressData->loadType(),
-        aWebProgressData->isLoadingDocument(), aWebProgressData->isTopLevel());
+    webProgress = new RemoteWebProgress(aManager, aWebProgressData->loadType(),
+                                        aWebProgressData->isLoadingDocument(),
+                                        aWebProgressData->isTopLevel());
   } else {
-    webProgress = new RemoteWebProgress(aManager, 0, 0, 0, false, false);
+    webProgress = new RemoteWebProgress(aManager, 0, false, false);
   }
   webProgress.forget(aOutWebProgress);
 
diff --git a/dom/ipc/PBrowser.ipdl b/dom/ipc/PBrowser.ipdl
index edede4fe533a..2991411ed665 100644
--- a/dom/ipc/PBrowser.ipdl
+++ b/dom/ipc/PBrowser.ipdl
@@ -106,7 +106,6 @@ struct WebProgressData
   bool isTopLevel;
   bool isLoadingDocument;
   uint32_t loadType;
-  uint64_t outerDOMWindowID;
   uint64_t innerDOMWindowID;
 };
 
diff --git a/dom/ipc/RemoteWebProgress.cpp b/dom/ipc/RemoteWebProgress.cpp
index b09c1edb8972..4374e542ce82 100644
--- a/dom/ipc/RemoteWebProgress.cpp
+++ b/dom/ipc/RemoteWebProgress.cpp
@@ -26,18 +26,6 @@ NS_IMETHODIMP RemoteWebProgress::Init(nsIWebProgress* aManager,
   return NS_OK;
 }
 
-NS_IMETHODIMP RemoteWebProgress::Update(uint64_t aOuterDOMWindowID,
-                                        uint64_t aInnerDOMWindowID,
-                                        uint32_t aLoadType,
-                                        bool aIsLoadingDocument) {
-  mOuterDOMWindowID = aOuterDOMWindowID;
-  mInnerDOMWindowID = aInnerDOMWindowID;
-  mLoadType = aLoadType;
-  mIsLoadingDocument = aIsLoadingDocument;
-
-  return NS_OK;
-}
-
 NS_IMETHODIMP RemoteWebProgress::AddProgressListener(
     nsIWebProgressListener* aListener, uint32_t aNotifyMask) {
   if (mManager) {
@@ -64,17 +52,6 @@ NS_IMETHODIMP RemoteWebProgress::GetDOMWindow(mozIDOMWindowProxy** aDOMWindow) {
   return NS_ERROR_NOT_AVAILABLE;
 }
 
-NS_IMETHODIMP RemoteWebProgress::GetDOMWindowID(uint64_t* aDOMWindowID) {
-  *aDOMWindowID = mOuterDOMWindowID;
-  return NS_OK;
-}
-
-NS_IMETHODIMP RemoteWebProgress::GetInnerDOMWindowID(
-    uint64_t* aInnerDOMWindowID) {
-  *aInnerDOMWindowID = mInnerDOMWindowID;
-  return NS_OK;
-}
-
 NS_IMETHODIMP RemoteWebProgress::GetIsTopLevel(bool* aIsTopLevel) {
   NS_ENSURE_ARG_POINTER(aIsTopLevel);
   *aIsTopLevel = mIsTopLevel;
diff --git a/dom/ipc/RemoteWebProgress.h b/dom/ipc/RemoteWebProgress.h
index ffed2aeaa02d..1212cac2ca44 100644
--- a/dom/ipc/RemoteWebProgress.h
+++ b/dom/ipc/RemoteWebProgress.h
@@ -22,18 +22,13 @@ class RemoteWebProgress final : public nsIRemoteWebProgress {
 
   RemoteWebProgress()
       : mManager(nullptr),
-        mOuterDOMWindowID(0),
-        mInnerDOMWindowID(0),
         mLoadType(0),
         mIsLoadingDocument(false),
         mIsTopLevel(false) {}
 
-  RemoteWebProgress(nsIWebProgress* aManager, uint64_t aOuterDOMWindowID,
-                    uint64_t aInnerDOMWindowID, uint32_t aLoadType,
+  RemoteWebProgress(nsIWebProgress* aManager, uint32_t aLoadType,
                     bool aIsLoadingDocument, bool aIsTopLevel)
       : mManager(aManager),
-        mOuterDOMWindowID(aOuterDOMWindowID),
-        mInnerDOMWindowID(aInnerDOMWindowID),
         mLoadType(aLoadType),
         mIsLoadingDocument(aIsLoadingDocument),
         mIsTopLevel(aIsTopLevel) {}
@@ -43,8 +38,6 @@ class RemoteWebProgress final : public nsIRemoteWebProgress {
 
   nsCOMPtr<nsIWebProgress> mManager;
 
-  uint64_t mOuterDOMWindowID;
-  uint64_t mInnerDOMWindowID;
   uint32_t mLoadType;
   bool mIsLoadingDocument;
   bool mIsTopLevel;
diff --git a/dom/ipc/WindowGlobalParent.cpp b/dom/ipc/WindowGlobalParent.cpp
index 3fd2ead1045c..18ff4437603f 100644
--- a/dom/ipc/WindowGlobalParent.cpp
+++ b/dom/ipc/WindowGlobalParent.cpp
@@ -493,9 +493,8 @@ void WindowGlobalParent::NotifyContentBlockingEvent(
       return;
     }
 
-    nsCOMPtr<nsIWebProgress> webProgress =
-        new RemoteWebProgress(manager, OuterWindowId(), InnerWindowId(), 0,
-                              false, BrowsingContext()->IsTopContent());
+    nsCOMPtr<nsIWebProgress> webProgress = new RemoteWebProgress(
+        manager, 0, false, BrowsingContext()->IsTopContent());
 
     Unused << managerAsListener->OnContentBlockingEvent(webProgress, aRequest,
                                                         event.value());
diff --git a/dom/ipc/nsIRemoteWebProgress.idl b/dom/ipc/nsIRemoteWebProgress.idl
index 9fe7c34f5aca..b9c8552556b1 100644
--- a/dom/ipc/nsIRemoteWebProgress.idl
+++ b/dom/ipc/nsIRemoteWebProgress.idl
@@ -14,17 +14,4 @@ interface nsIRemoteWebProgress : nsIWebProgress {
    */
   void init(in nsIWebProgress aManager,
             in boolean aIsTopLevel);
-
-  /**
-   * Update the RemoteWebProgress with values from the content process.
-   *
-   * @param aOuterWindowID The outer window ID.
-   * @param aInnerWindowID The inner window ID.
-   * @param aLoadType The load type.
-   * @param aIsLoadingDocument Whether or not a document is being loaded.
-   */
-  void update(in uint64_t aOuterWindowID,
-              in uint64_t aInnerWindowID,
-              in uint32_t aLoadType,
-              in boolean aIsLoadingDocument);
 };
diff --git a/toolkit/components/sessionstore/SessionStoreListener.cpp b/toolkit/components/sessionstore/SessionStoreListener.cpp
index 936025426a2f..0c34339de8e1 100644
--- a/toolkit/components/sessionstore/SessionStoreListener.cpp
+++ b/toolkit/components/sessionstore/SessionStoreListener.cpp
@@ -284,14 +284,8 @@ NS_IMETHODIMP TabListener::OnStateChange(nsIWebProgress* aWebProgress,
     return NS_OK;
   }
 
-  // The DOM Window ID getter here may throw if the inner or outer windows
-  // aren't created yet or are destroyed at the time we're making this call
-  // but that isn't fatal so ignore the exceptions here.
-  uint64_t DOMWindowID = 0;
-  Unused << aWebProgress->GetDOMWindowID(&DOMWindowID);
-  nsCOMPtr<nsPIDOMWindowOuter> window = do_GetInterface(mDocShell);
-  NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
-  if (DOMWindowID != window->WindowID()) {
+  nsCOMPtr<nsIWebProgress> webProgress = do_QueryInterface(mDocShell);
+  if (webProgress != aWebProgress) {
     return NS_OK;
   }
 
diff --git a/toolkit/components/statusfilter/nsBrowserStatusFilter.cpp b/toolkit/components/statusfilter/nsBrowserStatusFilter.cpp
index ba7205c529c4..318037b12e9e 100644
--- a/toolkit/components/statusfilter/nsBrowserStatusFilter.cpp
+++ b/toolkit/components/statusfilter/nsBrowserStatusFilter.cpp
@@ -71,20 +71,6 @@ nsBrowserStatusFilter::GetDOMWindow(mozIDOMWindowProxy** aResult) {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-NS_IMETHODIMP
-nsBrowserStatusFilter::GetDOMWindowID(uint64_t* aResult) {
-  *aResult = 0;
-  MOZ_ASSERT_UNREACHABLE("nsBrowserStatusFilter::GetDOMWindowID");
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
-NS_IMETHODIMP
-nsBrowserStatusFilter::GetInnerDOMWindowID(uint64_t* aResult) {
-  *aResult = 0;
-  MOZ_ASSERT_UNREACHABLE("nsBrowserStatusFilter::GetInnerDOMWindowID");
-  return NS_ERROR_NOT_IMPLEMENTED;
-}
-
 NS_IMETHODIMP
 nsBrowserStatusFilter::GetIsTopLevel(bool* aIsTopLevel) {
   *aIsTopLevel = false;
diff --git a/uriloader/base/nsDocLoader.cpp b/uriloader/base/nsDocLoader.cpp
index 20e352c170ba..068fdf850be4 100644
--- a/uriloader/base/nsDocLoader.cpp
+++ b/uriloader/base/nsDocLoader.cpp
@@ -980,42 +980,6 @@ nsDocLoader::GetDOMWindow(mozIDOMWindowProxy** aResult) {
   return CallGetInterface(this, aResult);
 }
 
-NS_IMETHODIMP
-nsDocLoader::GetDOMWindowID(uint64_t* aResult) {
-  *aResult = 0;
-
-  nsCOMPtr<mozIDOMWindowProxy> window;
-  nsresult rv = GetDOMWindow(getter_AddRefs(window));
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  nsCOMPtr<nsPIDOMWindowOuter> piwindow = nsPIDOMWindowOuter::From(window);
-  NS_ENSURE_STATE(piwindow);
-
-  *aResult = piwindow->WindowID();
-  return NS_OK;
-}
-
-NS_IMETHODIMP
-nsDocLoader::GetInnerDOMWindowID(uint64_t* aResult) {
-  *aResult = 0;
-
-  nsCOMPtr<mozIDOMWindowProxy> window;
-  nsresult rv = GetDOMWindow(getter_AddRefs(window));
-  NS_ENSURE_SUCCESS(rv, rv);
-
-  nsCOMPtr<nsPIDOMWindowOuter> outer = nsPIDOMWindowOuter::From(window);
-  NS_ENSURE_STATE(outer);
-
-  nsPIDOMWindowInner* inner = outer->GetCurrentInnerWindow();
-  if (!inner) {
-    // If we don't have an inner window, return 0.
-    return NS_OK;
-  }
-
-  *aResult = inner->WindowID();
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsDocLoader::GetIsTopLevel(bool* aResult) {
   nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(this);
diff --git a/uriloader/base/nsIWebProgress.idl b/uriloader/base/nsIWebProgress.idl
index b0cde5026dc7..70079adfff8a 100644
--- a/uriloader/base/nsIWebProgress.idl
+++ b/uriloader/base/nsIWebProgress.idl
@@ -137,8 +137,6 @@ interface nsIWebProgress : nsISupports
    *        Indicates that there is no associated DOM window.
    */
   readonly attribute mozIDOMWindowProxy DOMWindow;
-  readonly attribute uint64_t DOMWindowID;
-  readonly attribute uint64_t innerDOMWindowID;
 
   /**
    * Indicates whether DOMWindow.top == DOMWindow.