- Module performs devoid of generating any improve in the prevailing PrestaShop file so that existing customization and theme alter do not affect. In the very first case, to test the website page you want to Test the canonical tag for, you’ll must open the URL Inspection Tool, enter the https://www.presta-addons-modules.com/en/seo/prestashop-seo-automatic-hreflang-tags-canonical-tags-on-all-pages.html