That said, there are to achieve a portable Proton Mail experience. Option 1: The Official App (Workaround Method)
Once the Bridge is running, Thunderbird will see your Proton account as a local account.
Look for the folder containing the core files (usually under lib/net45 or similar in Electron apps). Move to USB: Copy these files to your portable drive. proton mail desktop app portable
While we wait for an official release from the Swiss team, using the PWA method or a portable browser is currently the most stable and secure way to carry your encrypted inbox in your pocket. It balances the need for privacy with the convenience of mobility.
Use a tool like 7-Zip to open the Proton Mail .exe installer. That said, there are to achieve a portable
If you don't want to mess with file extractions, the approach is the cleanest "lightweight" version.
Open Proton Mail in a portable browser (like or Firefox Portable ). Move to USB: Copy these files to your portable drive
onto your USB drive from PortableApps.com.