AuthRelay by JoyfulCoders

Sign in with Google on any desktop browser using your phone. AuthRelay detects OAuth pages, shows a QR code, and completes sign-in after you authenticate on your mobile device. Open source and end-to-end encrypted.

Experimental

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About this extension

AuthRelay lets you sign in with Google on desktop browsers using your Android phone — no passwords typed on the desktop, no credentials stored on any server.

How it works:

Visit any site with Google sign-in. AuthRelay detects the OAuth page automatically.
Click the extension icon and scan the QR code with the AuthRelay Android app.
Authenticate on your phone. Your desktop browser completes sign-in instantly.
Key features:

End-to-end encrypted — the relay server never sees your credentials
Zero-knowledge architecture — only encrypted blobs pass through the server
Ephemeral sessions — sessions expire automatically, nothing persists
Fully open source under the MIT License
No account required, no tracking, no bloat
Requirements:

AuthRelay Android app (free on Google Play)
A relay server (self-host or use the default)

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Permissions and data

Required permissions:

Access browser activity during navigation

Optional permissions:

Access your data for accounts.google.com
Access your data for firebaseinstallations.googleapis.com
Access your data for firebase.googleapis.com
Access your data for www.google-analytics.com
Access your data for analytics.google.com

Data collection:

The developer says this extension doesn't require data collection.

Optional data collection, according to the developer:

Technical and interaction data