diff -urN firefox-156.0-orig/browser/components/sessionstore/SessionStore.sys.mjs firefox-156.0/browser/components/sessionstore/SessionStore.sys.mjs
--- firefox-156.0-orig/browser/components/sessionstore/SessionStore.sys.mjs	2026-09-10 05:41:32 +0900
+++ firefox-156.0/browser/components/sessionstore/SessionStore.sys.mjs	2026-09-17 04:19:56 +0900
@@ -6438,9 +6438,9 @@
         // moveTo uses CSS pixels relative to aWindow, while aLeft and aRight
         // are on desktop pixels, undo the conversion we do in
         // #getWindowDimension.
-        let desktopToCssScale =
-          aWindow.desktopToDeviceScale / aWindow.devicePixelRatio;
-        aWindow.moveTo(aLeft * desktopToCssScale, aTop * desktopToCssScale);
+        //let desktopToCssScale =
+        //  aWindow.desktopToDeviceScale / aWindow.devicePixelRatio;
+        //aWindow.moveTo(aLeft * desktopToCssScale, aTop * desktopToCssScale);
       }
       if (
         aWidth &&