MySudo Web does not persistently store any user data in the browser. Any user data is only stored in browser memory as long as the user is in an active MySudo Web session.
In order to do this, MySudo Web uses the browser's local storage to store a session token; this allows the browser to maintain and reestablish connection to the MySudo app as long as you are in an active paired session. However, once your MySudo Web session has expired, the session token is forgotten by your browser.
Additionally, in an effort to protect your privacy and right to anonymity, any data in your browser is encrypted while it is in transit between the MySudo app and MySudo Web during a paired session. What this means is that even we can't see your user data, let alone any other potential middle man. Read more details here.