--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -5648,23 +5648,26 @@ nsWindow::ProcessMessage(UINT msg, WPARA
       }
       break;
     }
 
     case WM_MOVING:
       FinishLiveResizing(MOVING);
       if (WinUtils::IsPerMonitorDPIAware()) {
         // Sometimes, we appear to miss a WM_DPICHANGED message while moving
-        // a window around. Therefore, call ChangedDPI and ResetLayout here,
-        // which causes the prescontext and appshell window management code to
+        // a window around. Therefore, call ChangedDPI and ResetLayout here
+        // if it appears that the window's scaling is not what we expect.
+        // This causes the prescontext and appshell window management code to
         // check the appUnitsPerDevPixel value and current widget size, and
         // refresh them if necessary. If nothing has changed, these calls will
         // return without actually triggering any extra reflow or painting.
-        ChangedDPI();
-        ResetLayout();
+        if (WinUtils::LogToPhysFactor(mWnd) != mDefaultScale) {
+          ChangedDPI();
+          ResetLayout();
+        }
       }
       break;
 
     case WM_ENTERSIZEMOVE:
     {
       if (mResizeState == NOT_RESIZING) {
         mResizeState = IN_SIZEMOVE;
       }