diff -urN firefox-157.0-orig/browser/components/sessionstore/SessionStore.sys.mjs firefox-157.0/browser/components/sessionstore/SessionStore.sys.mjs
--- firefox-157.0-orig/browser/components/sessionstore/SessionStore.sys.mjs	2026-09-24 19:45:33 +0900
+++ firefox-157.0/browser/components/sessionstore/SessionStore.sys.mjs	2026-10-05 05:13:47 +0900
@@ -6828,10 +6828,10 @@
         // truncates rather than rounds, which for a window on a non-integrally
         // scaled monitor is enough to position it incorrectly (which may
         // break positioning constraints set by window managers).
-        getBaseWindow(aWindow).setPositionDesktopPix(
-          Math.round(aLeft),
-          Math.round(aTop)
-        );
+        //getBaseWindow(aWindow).setPositionDesktopPix(
+        //  Math.round(aLeft),
+        //  Math.round(aTop)
+        //);
       }
       if (
         aWidth &&