Firefox Relay is a feature provided by Mozilla Firefox that helps protect your email address and personal information while signing up for online services or subscriptions. It provides a temporary email address that you can use instead of your real email address.
When you want to sign up for a service, Firefox Relay generates a unique and random email address for that specific service. Any emails sent to that address are then forwarded to your actual email inbox, keeping your personal email address private. If you start receiving spam or unwanted emails from a specific service, you can easily disable or delete the relayed email address, cutting off any further communication from that service.
This feature acts as a shield against unwanted emails, spam, and potential data breaches of your personal email. It helps in maintaining your privacy and reducing the chances of your real email address being exposed to potential threats.