Privacy Policy — Gmail Auto Dark Mode

Last updated: March 9, 2026

Overview

Gmail Auto Dark Mode is a Chrome extension that applies a dark mode CSS filter to Gmail based on your system’s color scheme preference. This policy explains what data the extension does and does not collect.

Data collection

This extension collects no data of any kind. Specifically:

• It does not read, store, or transmit any email content.
• It does not collect any personally identifiable information (PII).
• It does not track browsing behavior or history.
• It does not use cookies or any form of local/session storage.
• It does not communicate with any external server or third-party service.

How the extension works

The extension only injects a CSS filter into https://mail.google.com/* to change the visual appearance of Gmail. It reads the OS-level color scheme preference (prefers-color-scheme) to decide whether to apply dark mode. All processing happens entirely within your browser.

Permissions

The extension declares a single host permission (https://mail.google.com/*) solely to allow the CSS injection. No other permissions are requested.

Changes to this policy

If this policy is updated, the new version will be published in this repository with an updated date.

Contact

If you have any questions about this privacy policy, please open an issue in the GitHub repository.