Privacy Policy

Last updated: October 9, 2026

This Privacy Policy explains how the AO3 Dark Mode browser extension and the AO3 Dark Mode website handle information. The extension and the website are treated separately because their data practices may differ.

In short: The AO3 Dark Mode extension is designed to apply a dark theme and save your preferences in your browser. The extension does not send your AO3 account credentials to us. The AO3 Dark Mode website uses Google Analytics to understand website traffic and visitor interactions.

1. What the extension does

AO3 Dark Mode changes the visual appearance of pages on archiveofourown.org using CSS and JavaScript running in your browser. The extension applies theme styling to the page you are viewing.

The extension is separate from the AO3 Dark Mode website. The website's use of Google Analytics does not, by itself, mean that the browser extension uses Google Analytics.

2. Information handled by the extension

Based on the extension's intended functionality, it does not need to collect your AO3 account credentials to apply its theme. Specifically, the extension is intended to operate as follows:

It does not ask you to provide your AO3 username or password.
It does not intentionally send the works, comments, or bookmarks you view to us.
It does not use Google Analytics within the extension, provided no analytics code or equivalent tracking is included in its package.
It does not sell personal information.

3. Settings stored by the extension

Your theme choice and reading preferences, such as font size, reading width, and brightness, may be saved using the browser's extension storage API.

Extension settings are stored through the browser's storage facilities.
The extension does not intentionally transmit these settings to a server operated by us.
You can remove stored extension settings by removing the extension or clearing its stored data in your browser.

The exact storage and synchronization behavior may depend on the browser and the APIs used by the installed version of the extension.

4. Permissions

The extension requests permissions needed for its functionality, such as access to the AO3 website and storage for saving preferences. The permissions actually used are determined by the installed extension version and its browser manifest.

5. Website analytics

The AO3 Dark Mode website uses Google Analytics to understand how visitors use the website and to measure website traffic.

Depending on the Google Analytics configuration, information may include page views, interactions with website pages, browser and device information, approximate geographic information, and identifiers or usage information associated with cookies or similar technologies.

This information may be processed by Google to provide analytics services and generate reports about website usage. Google Analytics is used on the website; this does not mean that the AO3 Dark Mode browser extension itself uses Google Analytics.

For more information, see How Google uses information from sites or apps that use its services and Google's Privacy Policy.

6. Third-party services

Google Analytics is a third-party service used by the AO3 Dark Mode website. Its processing of information is subject to Google's applicable terms and privacy documentation.

Apart from the website analytics described above, this policy should be read in light of the services actually integrated into the current website and extension versions.

7. Data retention and choices

Website analytics retention and data collection depend on the Google Analytics settings configured by the website operator. Browser settings may also allow you to manage or clear cookies and other locally stored website data.

Where required by applicable law, appropriate consent or other controls will be provided for analytics technologies.

8. Children's privacy

The website and extension are not intended to request children's personal information directly. However, the website's use of analytics may involve processing technical and usage information as described in this policy.

9. Changes to this policy

This Privacy Policy may be updated when the website's analytics configuration, extension functionality, or applicable requirements change. The date at the top of this page will be updated when material changes are made.

10. Contact

If you have any questions about this Privacy Policy or how AO3 Dark Mode handles information, please contact us by email: adnestbusiness@gmail.com.

11. Affiliation

AO3 Dark Mode is an independent, unofficial browser extension. It is not affiliated with, endorsed by, sponsored by, or officially connected with the Organization for Transformative Works (OTW) or Archive of Our Own (AO3).