InstAddr by kukusama

Notify you of new emails sent to InstAddr.

Furthermore, you can create and paste a discarded e-mail address directly from the "Create and paste discarded e-mail address" by right-clicking in the input box of any website.
* "Access All Websites" permission of this add-on is set for this function. Your privacy information will not be read or transmitted.

Right-click on the add-on icon to open the settings screen. You can change the sound, pop-up, volume, and type of sound.