CROSS-DOMAIN STORAGE

A method, system and product including a browser configured to render pages, wherein the browser comprises a client-side execution engine, wherein the browser is configured to execute an extension for the browser, wherein the extension is a computer program product that has a memory storage that is external to the client-side execution engine of the browser; and a set of pages that is defined over multiple domains, wherein the set of pages comprises respective instances of an additive software layer that is configured to execute a walkthrough over the multiple domains, wherein a page of the set of one or more pages comprises an instance of the respective instances and a communication element that is configured to enable the instance of the additive software layer to communicate data to and from the extension.