--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -6445,20 +6445,17 @@ nsGlobalWindow::CanMoveResizeWindows(boo
       uint32_t itemCount;
       if (NS_SUCCEEDED(treeOwner->GetTargetableShellCount(&itemCount)) &&
           itemCount > 1) {
         return false;
       }
     }
   }
 
-  // The preference is useful for the webapp runtime. Webapps should be able
-  // to resize or move their window.
-  if (mDocShell && !Preferences::GetBool("dom.always_allow_move_resize_window",
-                                         false)) {
+  if (mDocShell) {
     bool allow;
     nsresult rv = mDocShell->GetAllowWindowControl(&allow);
     if (NS_SUCCEEDED(rv) && !allow)
       return false;
   }
 
   if (gMouseDown && !gDragServiceDisabled) {
     nsCOMPtr<nsIDragService> ds =