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With Firefox Relay you can create up to 5 masks and use them whenever you need. You can also delete a mask if you no longer want to use it.

Warning: After deleting a mask, emails sent to it will no longer be forwarded to your real mail. This mask cannot be recovered and ⁨Firefox Relay will no longer forward messages sent to it. If you use a mask to sign in to sites you care about, you should update your login with a different email address before deleting it.

To permanently delete a mask

Sign in to the Relay Dashboard at relay.firefox.com.
Find the mask you want to delete.
Click the downward arrow to expand the options for that mask.
At the bottom right, click the Delete button to permanently remove that mask.
A confirmation window will appear informing you that deleted masks cannot be recovered. Check the box to acknowledge the notice.
Click Delete.
Congratulations! You have successfully deleted your email mask.