Privacy Policy

Effective date: February 22, 2026

Overview

MurMur is a Chrome browser extension developed by Regulus Labs. We are committed to protecting your privacy. This policy explains what data MurMur accesses, how it is used, and what is transmitted over the network.

The short version: MurMur does not collect, store, or transmit any personal data. All text processing happens locally in your browser.

Data MurMur Does Not Collect

MurMur does not collect any of the following:

• Personally identifiable information (name, email, address, etc.)
• Browsing history or page URLs
• Page content or article text
• Analytics, telemetry, or usage statistics
• Cookies or tracking identifiers
• Keystroke or interaction data

Data Processed Locally

When you activate MurMur on a webpage, the following processing occurs entirely within your browser:

• Article extraction — The page content is parsed using Mozilla's Readability library to extract the article text. This text never leaves your browser.
• Text-to-speech synthesis — For Chrome built-in voices, text is sent to Chrome's native TTS API, which is a local browser feature. For Piper AI voices, synthesis runs entirely in your browser using WebAssembly.
• Word highlighting — Text is tokenized into words for real-time highlighting. All processing is local.
• Preferences — Your settings (voice, speed, reading mode, pronunciation rules) are stored locally using Chrome's storage.sync API. This data is synced across your Chrome browsers via your Google account, handled by Chrome itself — MurMur has no access to your Google account.

Network Requests

MurMur makes the following network requests, and only these:

• Piper voice model downloads — When you select a Piper AI voice for the first time, MurMur downloads the voice model file from huggingface.co/rhasspy/piper-voices. This is a one-time download per voice. No user data or page content is included in this request.
• Piper voice list — MurMur fetches the list of available Piper voices (a JSON file) from the same HuggingFace repository. This contains only voice metadata (names, languages).

No page content, article text, user data, or browsing information is ever transmitted to any server.

Permissions

MurMur requests the following Chrome permissions, each for a specific purpose:

• activeTab — Accesses the content of the current tab when you click the MurMur icon, to extract article text for reading aloud.
• scripting — Injects content scripts for text extraction, highlighting, and the reader overlay into the active tab.
• storage — Saves your preferences (selected voice, speed, reading mode, custom pronunciation rules) locally.
• tts — Accesses Chrome's built-in text-to-speech engine to read text aloud.
• offscreen — Creates an offscreen document to run Piper TTS WebAssembly processing, which requires Web Workers.
• Host permission (huggingface.co) — Downloads Piper voice models and the voice list from HuggingFace's open model repository.

Third-Party Services

MurMur does not integrate with any third-party analytics, advertising, or tracking services. The only third-party interaction is downloading open-source voice models from HuggingFace as described above.

Data Retention

MurMur does not retain any data on external servers. Your preferences are stored locally in Chrome's storage. Downloaded voice models are cached by your browser. Uninstalling MurMur removes all stored data.

Children's Privacy

MurMur does not collect any personal information from anyone, including children under the age of 13.

Changes to This Policy

If we make changes to this privacy policy, we will update the effective date at the top of this page. Because MurMur does not collect contact information, we cannot notify you directly — we recommend reviewing this page periodically.

Contact

If you have questions about this privacy policy, contact us at support@reguluslabs.co.