diff --git a/dom/base/Document.cpp b/dom/base/Document.cpp
index 7e2de5bfbd28..e4b617b23b5c 100644
--- a/dom/base/Document.cpp
+++ b/dom/base/Document.cpp
@@ -3370,9 +3370,8 @@ void Document::SetDocumentURI(nsIURI* aURI) {
 
   // Tell our WindowGlobalParent that the document's URI has been changed.
   nsPIDOMWindowInner* inner = GetInnerWindow();
-  WindowGlobalChild* wgc = inner ? inner->GetWindowGlobalChild() : nullptr;
-  if (wgc) {
-    Unused << wgc->SendUpdateDocumentURI(mDocumentURI);
+  if (inner && inner->GetWindowGlobalChild()) {
+    inner->GetWindowGlobalChild()->SetDocumentURI(mDocumentURI);
   }
 }
 
diff --git a/dom/base/nsGlobalWindowOuter.cpp b/dom/base/nsGlobalWindowOuter.cpp
index 0c16381263e0..a901c79bd66f 100644
--- a/dom/base/nsGlobalWindowOuter.cpp
+++ b/dom/base/nsGlobalWindowOuter.cpp
@@ -2215,9 +2215,9 @@ nsresult nsGlobalWindowOuter::SetNewDocument(Document* aDocument,
 
   // Tell the WindowGlobalParent that it should become the current window global
   // for our BrowsingContext if it isn't already.
-  mInnerWindow->GetWindowGlobalChild()->SendUpdateDocumentURI(
-      aDocument->GetDocumentURI());
-  mInnerWindow->GetWindowGlobalChild()->SendBecomeCurrentWindowGlobal();
+  WindowGlobalChild* wgc = mInnerWindow->GetWindowGlobalChild();
+  wgc->SetDocumentURI(aDocument->GetDocumentURI());
+  wgc->SendBecomeCurrentWindowGlobal();
 
   // We no longer need the old inner window.  Start its destruction if
   // its not being reused and clear our reference.
diff --git a/dom/ipc/WindowGlobalChild.cpp b/dom/ipc/WindowGlobalChild.cpp
index 0e546b9905ad..16544553cdb5 100644
--- a/dom/ipc/WindowGlobalChild.cpp
+++ b/dom/ipc/WindowGlobalChild.cpp
@@ -40,13 +40,21 @@ namespace dom {
 typedef nsRefPtrHashtable<nsUint64HashKey, WindowGlobalChild> WGCByIdMap;
 static StaticAutoPtr<WGCByIdMap> gWindowGlobalChildById;
 
-WindowGlobalChild::WindowGlobalChild(nsGlobalWindowInner* aWindow,
-                                     dom::BrowsingContext* aBrowsingContext)
+WindowGlobalChild::WindowGlobalChild(const WindowGlobalInit& aInit,
+                                     nsGlobalWindowInner* aWindow)
     : mWindowGlobal(aWindow),
-      mBrowsingContext(aBrowsingContext),
-      mInnerWindowId(aWindow->WindowID()),
-      mOuterWindowId(aWindow->GetOuterWindow()->WindowID()),
-      mBeforeUnloadListeners(0) {}
+      mBrowsingContext(aInit.browsingContext()),
+      mDocumentPrincipal(aInit.principal()),
+      mDocumentURI(aInit.documentURI()),
+      mInnerWindowId(aInit.innerWindowId()),
+      mOuterWindowId(aInit.outerWindowId()),
+      mBeforeUnloadListeners(0) {
+  MOZ_DIAGNOSTIC_ASSERT(mBrowsingContext);
+  MOZ_DIAGNOSTIC_ASSERT(mDocumentPrincipal);
+
+  MOZ_ASSERT(mInnerWindowId == aWindow->WindowID());
+  MOZ_ASSERT(mOuterWindowId == aWindow->GetOuterWindow()->WindowID());
+}
 
 already_AddRefed<WindowGlobalChild> WindowGlobalChild::Create(
     nsGlobalWindowInner* aWindow) {
@@ -69,7 +77,11 @@ already_AddRefed<WindowGlobalChild> WindowGlobalChild::Create(
     bc->SetOpenerPolicy(policy);
   }
 
-  RefPtr<WindowGlobalChild> wgc = new WindowGlobalChild(aWindow, bc);
+  WindowGlobalInit init(principal, aWindow->GetDocumentURI(), bc,
+                        aWindow->WindowID(),
+                        aWindow->GetOuterWindow()->WindowID());
+
+  auto wgc = MakeRefPtr<WindowGlobalChild>(init, aWindow);
 
   // If we have already closed our browsing context, return a pre-destroyed
   // WindowGlobalChild actor.
@@ -78,9 +90,6 @@ already_AddRefed<WindowGlobalChild> WindowGlobalChild::Create(
     return wgc.forget();
   }
 
-  WindowGlobalInit init(principal, aWindow->GetDocumentURI(), bc,
-                        wgc->mInnerWindowId, wgc->mOuterWindowId);
-
   // Send the link constructor over PInProcessChild or PBrowser.
   if (XRE_IsParentProcess()) {
     InProcessChild* ipc = InProcessChild::Singleton();
@@ -337,8 +346,9 @@ void WindowGlobalChild::ReceiveRawMessage(const JSWindowActorMessageMeta& aMeta,
   }
 }
 
-nsIURI* WindowGlobalChild::GetDocumentURI() {
-  return mWindowGlobal->GetDocumentURI();
+void WindowGlobalChild::SetDocumentURI(nsIURI* aDocumentURI) {
+  mDocumentURI = aDocumentURI;
+  SendUpdateDocumentURI(aDocumentURI);
 }
 
 const nsAString& WindowGlobalChild::GetRemoteType() {
diff --git a/dom/ipc/WindowGlobalChild.h b/dom/ipc/WindowGlobalChild.h
index 3607fd477fe7..374f85e89ab6 100644
--- a/dom/ipc/WindowGlobalChild.h
+++ b/dom/ipc/WindowGlobalChild.h
@@ -57,6 +57,9 @@ class WindowGlobalChild final : public WindowGlobalActor,
   // in the chrome process.
   bool IsInProcess() { return XRE_IsParentProcess(); }
 
+  nsIURI* GetDocumentURI() override { return mDocumentURI; }
+  void SetDocumentURI(nsIURI* aDocumentURI);
+
   // The Window ID for this WindowGlobal
   uint64_t InnerWindowId() { return mInnerWindowId; }
   uint64_t OuterWindowId() { return mOuterWindowId; }
@@ -90,10 +93,12 @@ class WindowGlobalChild final : public WindowGlobalActor,
   static already_AddRefed<WindowGlobalChild> Create(
       nsGlobalWindowInner* aWindow);
 
+  WindowGlobalChild(const WindowGlobalInit& aInit,
+                    nsGlobalWindowInner* aWindow);
+
   nsISupports* GetParentObject();
   JSObject* WrapObject(JSContext* aCx,
                        JS::Handle<JSObject*> aGivenProto) override;
-  nsIURI* GetDocumentURI() override;
 
  protected:
   const nsAString& GetRemoteType() override;
@@ -118,12 +123,13 @@ class WindowGlobalChild final : public WindowGlobalActor,
   virtual void ActorDestroy(ActorDestroyReason aWhy) override;
 
  private:
-  WindowGlobalChild(nsGlobalWindowInner* aWindow, dom::BrowsingContext* aBc);
   ~WindowGlobalChild();
 
   RefPtr<nsGlobalWindowInner> mWindowGlobal;
   RefPtr<dom::BrowsingContext> mBrowsingContext;
   nsRefPtrHashtable<nsStringHashKey, JSWindowActorChild> mWindowActors;
+  nsCOMPtr<nsIPrincipal> mDocumentPrincipal;
+  nsCOMPtr<nsIURI> mDocumentURI;
   uint64_t mInnerWindowId;
   uint64_t mOuterWindowId;
   int64_t mBeforeUnloadListeners;