A feature-rich browser extension that lets you read, compose, and manage your Proton Mail right from the toolbar — without ever opening a tab.
Firefox Extension
End-to-End Encrypted
📩 Inbox at a Glance
- Unread count badge on the toolbar icon
- Message list with sender, subject, time & preview
- Full message preview without leaving the popup
- HTML and plain-text rendering modes
- Configurable preview lines (0–10)
👥 Multi-Account
- Monitor multiple Proton Mail accounts simultaneously
- Per-account folder monitoring
- Quick account switching with account pills
- Account alignment with Proton web slots
- Separate notification settings per account
✎ Compose & Reply
- Full email composition directly in the popup
- Reply, Reply All, and Forward
- Rich text editor with formatting, colors & links
- File attachments, drag-and-drop & clipboard paste
- Draft auto-save and persistence
- Contact autocomplete for recipients
- Built-in spellcheck with 20+ languages
⚡ Quick Actions
- Mark as read/unread, star, archive, trash
- Move to folder and apply labels
- Snooze messages (1 h, 3 h, tomorrow, next week)
- Report phishing, view headers & details
- Drag-to-reorder and show/hide individual actions
- Keyboard shortcuts (j/k, e, #, r, Enter, Esc)
🔔 Notifications & DND
- Desktop notifications for new mail
- Configurable sounds (chime, bell, ding) with volume
- Notification click actions (open, mark read, archive…)
- Do Not Disturb with preset & custom durations
- DND icon indicator
📅 Calendar Integration
- Detect calendar invitations in messages
- RSVP directly (accept, tentative, decline)
- View attendee status for each event
🎨 Themes & Customization
- Three UI themes: Classic, Modern, Material
- Light, Dark, and Auto color schemes
- Adjustable popup width (350–800px) and height (300–600px)
- Display density: Comfortable, Cozy, Compact
- Custom CSS injection with current-CSS export
🔒 Security & Privacy
- SRP authentication — password never leaves your device
- Two-factor authentication (TOTP) and FIDO2 security keys
- OpenPGP message and attachment decryption
- Encrypted session keys stored in browser
- Communicates only with *.proton.me
🛠 Behavior & Automation
- Auto-mark-read on preview, reply, archive, delete…
- Auto-advance to next message after action
- Cross-account and wrap-around navigation
- Adjustable polling interval (30 s – 60 min)
- Real-time sync via Proton event system
🌐 Languages & Data
- Translated into 30+ languages
- Settings export & import (JSON)
- Firefox sync for cross-device settings
- Mailto: handler registration
- Debug logging for troubleshooting
Free & Pro
Use the free version indefinitely or upgrade to Pro for the full experience.
Free
€0 — forever
- Single Proton account
- Unread count badge & message list
- Message preview (HTML & plain text)
- Basic desktop notifications
- Light, Dark & Auto theme
- End-to-end encryption
- Multi-account support
- Compose, reply & forward
- Quick actions (archive, labels, snooze…)
- Calendar invitation RSVP
- Notification sounds & DND mode
- Advanced themes, density & custom CSS
- Keyboard shortcuts
- Settings export, import & Firefox sync
Pro
€2 / month
- Everything in Free
- Unlimited accounts with per-account folders
- Full compose, reply, reply-all & forward
- Rich text editor with attachments
- All quick actions & automation rules
- Calendar invitation RSVP & attendee status
- Notification sounds, click actions & DND
- Three UI themes, density & custom CSS
- Keyboard shortcuts
- Settings export, import & Firefox sync
- Mailto: handler registration
- All future updates included
Payments processed by Paddle.com, our Merchant of Record.
Features and pricing are indicative and subject to change until final release.
A native Android sync adapter that brings your Proton Contacts and Proton Calendar to every app on your phone — fully encrypted, fully offline-capable.
Android 8.0+
End-to-End Encrypted
👤 Contacts Sync
- Full two-way sync with Proton Contacts
- All fields: name, email, phone, address, photo, birthday…
- Contact groups / labels
- Works with Samsung Contacts & Google Contacts
- Intelligent conflict detection with resolution UI
- Incremental sync — only changed contacts are fetched
📅 Calendar Sync
- Full two-way sync with Proton Calendar
- Events, all-day events, time zones, locations, descriptions
- Full recurring event support (RRULE, RDATE, EXDATE)
- Edit single occurrence, this-and-future, or entire series
- Reminders / alarms mapped to Android notifications
- Multiple calendar support with colors
👥 Attendees & Invitations
- Attendee management with participation status
- Send invitation, update, and cancellation emails
- Poll attendee responses (accepted / declined / tentative)
- Organizer details and roles
🔒 Security & Authentication
- SRP 6a — password never transmitted in plaintext
- Two-factor authentication (TOTP)
- Hardware-backed Keystore for credentials
- AES-256-GCM encrypted local token storage
- OpenPGP encryption for all contact & calendar data
- No analytics, tracking, or third-party data sharing
🔄 Sync Framework
- Configurable intervals: 15 min, 30 min, 1 h, 4 h, or custom
- Manual sync and full re-sync (Remote→Local / Local→Remote)
- Lightweight event-loop poller between full syncs
- Background WorkManager with battery-optimization guidance
- Separate intervals for contacts and calendar
👥 Multi-Account
- Multiple Proton accounts on one device
- Per-account sync settings and intervals
- Per-account enable/disable for contacts & calendar
- Custom display names per account
- Easy re-authentication and account removal
⚙ Settings & Configuration
- Card-based, collapsible per-account settings
- Calendar sync timeframe (past & future days)
- Exclude external / subscribed calendars
- Notification-on-failure toggle
- 25 languages supported
📋 Diagnostics & Logging
- Real-time sync log viewer with auto-scroll
- Copy and export logs for troubleshooting
- Sync trigger labeling (Manual, Scheduled…)
- Detailed encryption and network request logs
Free & Pro
Use the free version indefinitely or upgrade to Pro for the full experience.
Free
€0 — forever
- Single Proton account
- Contacts sync (two-way)
- Calendar sync (two-way)
- Basic recurring events
- Reminders & alarms
- End-to-end encryption (OpenPGP)
- Multi-account support
- Custom sync intervals
- Calendar sync timeframe configuration
- Attendee polling & invitation emails
- External / subscribed calendar control
- Full re-sync (Remote→Local / Local→Remote)
Pro
€2 / month
- Everything in Free
- Unlimited accounts with per-account settings
- Custom sync intervals & event-loop polling
- Calendar sync timeframe (past & future days)
- Attendee status polling
- Send invitation, update & cancellation emails
- External / subscribed calendar control
- Full re-sync (Remote→Local / Local→Remote)
- Sync log viewer & export
- All future updates included
Available on the Google Play Store. Payments handled by Google Play.
Features and pricing are indicative and subject to change until final release.