diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
index 37745acc3329..0e5314d2ad6f 100644
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -408,7 +408,6 @@ nsWindow::nsWindow()
       mPanInProgress(false),
       mDrawToContainer(false),
       mTitlebarBackdropState(false),
-      mIsPIPWindow(false),
       mIsWaylandPanelWindow(false),
       mIsChildWindow(false),
       mAlwaysOnTop(false),
@@ -5908,7 +5907,6 @@ nsresult nsWindow::Create(nsIWidget* aParent, nsNativeWidget aNativeParent,
   }
 
   mAlwaysOnTop = aInitData && aInitData->mAlwaysOnTop;
-  mIsPIPWindow = aInitData && aInitData->mPIPWindow;
   // mNoAutoHide seems to be always false here.
   // The mNoAutoHide state is set later on nsMenuPopupFrame level
   // and can be changed so we use WaylandPopupIsPermanent() to get
diff --git a/widget/gtk/nsWindow.h b/widget/gtk/nsWindow.h
index d80cdde02a28..fa90621be478 100644
--- a/widget/gtk/nsWindow.h
+++ b/widget/gtk/nsWindow.h
@@ -658,8 +658,6 @@ class nsWindow final : public nsBaseWidget {
   bool mDrawToContainer : 1;
   // Draw titlebar with :backdrop css state (inactive/unfocused).
   bool mTitlebarBackdropState : 1;
-  // It's PictureInPicture window.
-  bool mIsPIPWindow : 1;
   // It's undecorated popup utility window, without resizers/titlebar,
   // movable by mouse. Used on Wayland for popups without
   // parent (for instance WebRTC sharing indicator, notifications).
diff --git a/widget/nsBaseWidget.cpp b/widget/nsBaseWidget.cpp
index b723ebd4dfb4..a872c904e2b8 100644
--- a/widget/nsBaseWidget.cpp
+++ b/widget/nsBaseWidget.cpp
@@ -154,7 +154,8 @@ nsBaseWidget::nsBaseWidget(BorderStyle aBorderStyle)
       mIMEHasQuit(false),
       mIsFullyOccluded(false),
       mNeedFastSnaphot(false),
-      mCurrentPanGestureBelongsToSwipe(false) {
+      mCurrentPanGestureBelongsToSwipe(false),
+      mIsPIPWindow(false) {
 #ifdef NOISY_WIDGET_LEAKS
   gNumWidgets++;
   printf("WIDGETS+ = %d\n", gNumWidgets);
@@ -419,6 +420,7 @@ void nsBaseWidget::BaseCreate(nsIWidget* aParent, widget::InitData* aInitData) {
     mPopupLevel = aInitData->mPopupLevel;
     mPopupType = aInitData->mPopupHint;
     mHasRemoteContent = aInitData->mHasRemoteContent;
+    mIsPIPWindow = aInitData->mPIPWindow;
   }
 
   if (aParent) {
@@ -2313,6 +2315,7 @@ nsBaseWidget::SwipeInfo nsBaseWidget::SendMayStartSwipe(
 WidgetWheelEvent nsBaseWidget::MayStartSwipeForAPZ(
     const PanGestureInput& aPanInput, const APZEventResult& aApzResult) {
   WidgetWheelEvent event = aPanInput.ToWidgetEvent(this);
+
   if (aPanInput.AllowsSwipe()) {
     SwipeInfo swipeInfo = SendMayStartSwipe(aPanInput);
     event.mCanTriggerSwipe = swipeInfo.wantsSwipe;
diff --git a/widget/nsBaseWidget.h b/widget/nsBaseWidget.h
index 0ac102f71dbc..4b7c963e9376 100644
--- a/widget/nsBaseWidget.h
+++ b/widget/nsBaseWidget.h
@@ -674,6 +674,8 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
   void FreeShutdownObserver();
   void FreeLocalesChangedObserver();
 
+  bool IsPIPWindow() const { return mIsPIPWindow; };
+
   nsIWidgetListener* mWidgetListener;
   nsIWidgetListener* mAttachedWidgetListener;
   nsIWidgetListener* mPreviouslyAttachedWidgetListener;
@@ -721,6 +723,9 @@ class nsBaseWidget : public nsIWidget, public nsSupportsWeakReference {
   // a PANGESTURE_(MAY)START event).
   bool mCurrentPanGestureBelongsToSwipe;
 
+  // It's PictureInPicture window.
+  bool mIsPIPWindow : 1;
+
   struct InitialZoomConstraints {
     InitialZoomConstraints(const uint32_t& aPresShellID,
                            const ScrollableLayerGuid::ViewID& aViewID,