--- a/toolkit/toolkit/global/unknownContentType.ftl
+++ b/toolkit/toolkit/global/unknownContentType.ftl
@@ -1,4 +1,10 @@
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+unknowncontenttype-settingschange =
+    .value =
+        { PLATFORM() ->
+            [windows] Sozlamalarni { -brand-short-name }'ning moslamalaridan o‘zgartirsa bo‘ladi.
+           *[other] Sozlamalarni { -brand-short-name }'ning parametrlaridan o‘zgartirish mumkin.
+        }