ProtonMail Notifier от PixelReveur

Fork of ProtonMail (unofficial) :
https://cup.aihedy.com/firefox/addon/protonmail

Unofficial ProtonMail extension. Provides notifications and makes it possible to close the ProtonMail tab, and even the browser, without getting logged out.

General Settings:
- Fetch interval: Select how often the extension will check for new emails.
- Language selection: Choose the language of the extension. English, French, or German.

Settings:
- Persist session: Check it to keep the sessions in browser memory.
- Persist session even if browser is closed: Check it to save the sessions to disk. WARNING: Your mailbox password will be written to your hard drive.
- Show unread count badge: A badge will show on the extension icon with the number of unread emails on the INBOX.
- Show notifications on new emails: If checked then the extension will show a notification when you receive an email.
- Enable peeking: If checked then you will be able to see a list of your inbox unread emails in the extension itself.