The administration can decide to help or disable currency and language auto-change functions. Also, alter the default shop currency and language from the module management page. In the event the module won't locate appropriate currency and language as per visitors' area then default currency and language will probably be applied. https://www.presta-addons-modules.com/en/front-office/prestashop-browser-tab-notifications-cart-count-in-tab-cart-remainder.html