diff --git a/th/browser/browser/preferences/zen-preferences.ftl b/th/browser/browser/preferences/zen-preferences.ftl
index e32687cd43..f60dbe3b69 100644
--- a/th/browser/browser/preferences/zen-preferences.ftl
+++ b/th/browser/browser/preferences/zen-preferences.ftl
@@ -19,6 +19,8 @@ zen-look-and-feel-compact-view-enabled =
     .label = Enable { -brand-short-name }'s compact mode
 zen-look-and-feel-compact-view-top-toolbar = 
     .label = Hide the top toolbar as well in compact mode
+zen-look-and-feel-compact-toolbar-flash-popup = 
+    .label = Briefly make the toolbar popup when switching or opening new tabs in compact mode
 zen-look-and-feel-buttons-header = Button style
 zen-look-and-feel-buttons-description = Choose the style of buttons you want to see
 zen-look-and-feel-pilled-buttons =