diff --git a/dom/base/nsDocument.cpp b/dom/base/nsDocument.cpp
index ebb4aa1e5b71..e44b3edf61e2 100644
--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -12314,6 +12314,65 @@ private:
   bool mUserInputOrChromeCaller;
 };
 
+static bool
+ShouldLockPointer(Element* aElement, Element* aCurrentLock,
+                  bool aNoFocusCheck = false)
+{
+  // Check if pointer lock pref is enabled
+  if (!Preferences::GetBool("full-screen-api.pointer-lock.enabled")) {
+    NS_WARNING("ShouldLockPointer(): Pointer Lock pref not enabled");
+    return false;
+  }
+
+  nsCOMPtr<nsIDocument> ownerDoc = aElement->OwnerDoc();
+  if (aCurrentLock && aCurrentLock->OwnerDoc() != ownerDoc) {
+    NS_WARNING("ShouldLockPointer(): Existing pointer lock element in a different document");
+    return false;
+  }
+
+  if (!aElement->IsInUncomposedDoc()) {
+    NS_WARNING("ShouldLockPointer(): Element without Document");
+    return false;
+  }
+
+  if (ownerDoc->GetSandboxFlags() & SANDBOXED_POINTER_LOCK) {
+    NS_WARNING("ShouldLockPointer(): Document is sandboxed and doesn't allow pointer-lock");
+    return false;
+  }
+
+  // Check if the element is in a document with a docshell.
+  if (!ownerDoc->GetContainer()) {
+    return false;
+  }
+  nsCOMPtr<nsPIDOMWindowOuter> ownerWindow = ownerDoc->GetWindow();
+  if (!ownerWindow) {
+    return false;
+  }
+  nsCOMPtr<nsPIDOMWindowInner> ownerInnerWindow = ownerDoc->GetInnerWindow();
+  if (!ownerInnerWindow) {
+    return false;
+  }
+  if (ownerWindow->GetCurrentInnerWindow() != ownerInnerWindow) {
+    return false;
+  }
+
+  nsCOMPtr<nsPIDOMWindowOuter> top = ownerWindow->GetScriptableTop();
+  if (!top || !top->GetExtantDoc() || top->GetExtantDoc()->Hidden()) {
+    NS_WARNING("ShouldLockPointer(): Top document isn't visible.");
+    return false;
+  }
+
+  if (!aNoFocusCheck) {
+    mozilla::ErrorResult rv;
+    if (!top->GetExtantDoc()->HasFocus(rv)) {
+      NS_WARNING("ShouldLockPointer(): Top document isn't focused.");
+      return false;
+    }
+  }
+
+  return true;
+}
+
 NS_IMETHODIMP
 PointerLockRequest::Run()
 {
@@ -12333,7 +12392,7 @@ PointerLockRequest::Run()
   }
 
   // Note, we must bypass focus change, so pass true as the last parameter!
-  if (!d->ShouldLockPointer(e, pointerLockedElement, true)) {
+  if (!ShouldLockPointer(e, pointerLockedElement, true)) {
     DispatchPointerLockError(d);
     return NS_OK;
   }
@@ -12389,65 +12448,6 @@ nsDocument::RequestPointerLock(Element* aElement)
                                                  userInputOrChromeCaller));
 }
 
-bool
-nsDocument::ShouldLockPointer(Element* aElement, Element* aCurrentLock,
-                              bool aNoFocusCheck)
-{
-  // Check if pointer lock pref is enabled
-  if (!Preferences::GetBool("full-screen-api.pointer-lock.enabled")) {
-    NS_WARNING("ShouldLockPointer(): Pointer Lock pref not enabled");
-    return false;
-  }
-
-  if (aCurrentLock && aCurrentLock->OwnerDoc() != aElement->OwnerDoc()) {
-    NS_WARNING("ShouldLockPointer(): Existing pointer lock element in a different document");
-    return false;
-  }
-
-  if (!aElement->IsInUncomposedDoc()) {
-    NS_WARNING("ShouldLockPointer(): Element without Document");
-    return false;
-  }
-
-  if (mSandboxFlags & SANDBOXED_POINTER_LOCK) {
-    NS_WARNING("ShouldLockPointer(): Document is sandboxed and doesn't allow pointer-lock");
-    return false;
-  }
-
-  // Check if the element is in a document with a docshell.
-  nsCOMPtr<nsIDocument> ownerDoc = aElement->OwnerDoc();
-  if (!ownerDoc->GetContainer()) {
-    return false;
-  }
-  nsCOMPtr<nsPIDOMWindowOuter> ownerWindow = ownerDoc->GetWindow();
-  if (!ownerWindow) {
-    return false;
-  }
-  nsCOMPtr<nsPIDOMWindowInner> ownerInnerWindow = ownerDoc->GetInnerWindow();
-  if (!ownerInnerWindow) {
-    return false;
-  }
-  if (ownerWindow->GetCurrentInnerWindow() != ownerInnerWindow) {
-    return false;
-  }
-
-  nsCOMPtr<nsPIDOMWindowOuter> top = ownerWindow->GetScriptableTop();
-  if (!top || !top->GetExtantDoc() || top->GetExtantDoc()->Hidden()) {
-    NS_WARNING("ShouldLockPointer(): Top document isn't visible.");
-    return false;
-  }
-
-  if (!aNoFocusCheck) {
-    mozilla::ErrorResult rv;
-    if (!top->GetExtantDoc()->HasFocus(rv)) {
-      NS_WARNING("ShouldLockPointer(): Top document isn't focused.");
-      return false;
-    }
-  }
-
-  return true;
-}
-
 bool
 nsDocument::SetPointerLock(Element* aElement, int aCursorStyle)
 {
diff --git a/dom/base/nsDocument.h b/dom/base/nsDocument.h
index 01ac0e58289c..3853f9350c0b 100644
--- a/dom/base/nsDocument.h
+++ b/dom/base/nsDocument.h
@@ -1268,8 +1268,6 @@ public:
   Element* GetFullscreenElement() override;
 
   void RequestPointerLock(Element* aElement) override;
-  bool ShouldLockPointer(Element* aElement, Element* aCurrentLock,
-                         bool aNoFocusCheck = false);
   bool SetPointerLock(Element* aElement, int aCursorStyle);
   static void UnlockPointer(nsIDocument* aDoc = nullptr);