--- a/browser/base/content/navigator-toolbox.inc.xhtml	2025-08-12 02:31:44.000000000 +0900
+++ b/browser/base/content/navigator-toolbox.inc.xhtml	2025-08-26 21:10:15.709368257 +0900
@@ -41,6 +41,7 @@
                        role="button"
                        aria-pressed="false"
                        cui-areatype="toolbar"
+                       hidden="true"
                        removable="true"/>
 
         <tabs id="tabbrowser-tabs"