A feature-rich browser extension that lets you read, compose, and manage your Proton Mail right from the toolbar — without ever opening a tab.
*.proton.meHere’s what the extension stores, and where. All traffic goes to Proton’s servers except for hCaptcha (during human verification) and a small license-check endpoint for Pro subscriptions. No analytics, no telemetry.
Security boundary. The encryption key for the at-rest secrets is stored in the same browser-storage area, so this protects against casual profile inspection and accidental exposure in backups, but not against malicious browser extensions or a compromised user profile. If that’s in your threat model, Proton Mail in a private browser profile with only vetted extensions is the stronger choice.
Want stricter isolation? If you’d rather have no Proton data touching local extension storage — or any other link in the chain — use Proton Mail’s web interface directly, which keeps everything in the tab session only. You give up popup convenience in exchange for zero additional trust.
Use the free version indefinitely or upgrade to Pro for the full experience.
€0
Includes a 14-day Pro trial — try every feature first
€2.38
per month, or €26.18 / year · incl. German VAT (other countries may differ)
One subscription is for a single person. For team, family or business use, contact me. Payments processed by Paddle.com, our Merchant of Record.
Replies are personal — no ticketing systems, no chatbots.
Please include the extension version (Settings → About) and your Firefox or Chrome version when reporting bugs.
A native Android sync adapter for Proton Contacts and Proton Calendar — fully encrypted, works with every app on your phone.