In order to discover the fields within a page in which the user can enter an email address so that we could autofill them, we needed to extend the functionality of the Firefox browser. Since Relay is new and in Beta and we wanted a mechanism to deliver updates and fixes quickly, the best route for us to deliver the browser side portion of Relay was through an add-on. In the future, we may include that Relay functionality in the Firefox browser so a separate add-on is not necessary. Relay can be used without the add-on (for example with a non-Firefox browser) by visiting the relay.firefox.com site and copy and pasting email aliases into the email address fields.