Shadowmute per The Srs Biznas Company, LLC

The Shadowmute browser extension allows users of the Shadowmute Identity-as-a-Service platform to generate mailboxes without having to log in to the site.

The extension will automatically populate the associated site field with the active site being visited when the mailbox is generated.

Please note that this Add-on requires a functional Shadowmute account, which is currently in private beta.