Manual:$wgCookiePrefix/ja

詳細
Cookie および類似するブラウザー データ (localStorage を含む) の接頭辞です. Set it to use a custom one. Setting it to  or an empty string sets the default of using the database name. Code should ensure browser saved data is prefixed with this value (this is currently done automatically only when  is used without a custom prefix).

既定値は 内で決定されます.