Your profile folder contains a <a data-l10n-name="user-js-link">user.js file</a>, which includes preferences that were not created by { -brand-short-name }.
Mae eich ffolder profil yn cynnwys <a data-l10n-name="user-js-link">ffeil user.js</a>, sy'n cynnwys dewisiadau sydd heb eu creu gan { -brand-short-name }.