TacoMail от Oskar2517

This extension enables you to generate disposable email addresses, ideal for registering on websites where sharing your actual email isn't desired. This safeguards against potential misuse, including spam and fraudulent activities.

It allows you to see the content of emails (both HTML and text), delete them and download their attachments.

All emails will be automatically deleted after one hour.

Both the extension and backend service are open source and can be found on GitHub:
https://github.com/oskar2517/tacomail
https://github.com/oskar2517/tacomail-extension