Muon Browser Agent
Privacy Policy
Last updated: 12 October 2026
Muon Browser Agent ("the extension") is an open-source browser extension for Chrome, Brave and Edge published by an independent developer. Source code: https://github.com/harshdvaid24/muon-browser-agent
Summary
- The developer runs no server and does not receive, store, sell or share your data.
- The extension sends page content and your instructions only to the AI model provider that you configure: a model server on your own computer, or a cloud provider using your own API key.
- Your settings, API keys, chat history and recorded workflows stay in your browser's local extension storage.
Data the extension handles
| Data | Why | Where it goes |
|---|---|---|
| Your task instructions and chat messages | To carry out the task | Your configured AI provider. Saved as chat history in local extension storage until you delete it. |
| Content of web pages the agent works on (text, element lists, URLs, titles) | So the model can decide what to do on the page | Your configured AI provider only. |
| Screenshots of the current tab (only if you turn on "vision") | Gives the model a visual view of the page | Your configured AI provider only. |
| API keys and provider settings | To call the provider you chose | Local extension storage (chrome.storage.local) only. Sent only to that provider, in its own request headers. |
| Recorded workflows (your clicks, page addresses and form values) | To replay a workflow later | Local extension storage only. Values from password, card, token, one-time-code and similar fields are not recorded, and passwords embedded in URLs are removed. |
| File upload permissions (short name, file path, allowed website) | To attach a file you approved to the site you approved | Session storage. Cleared when the browser closes. The file path is never sent to the model. The file is sent only to the website you approved. |
| Voice recordings (only if you use the microphone button and set up speech-to-text) | To turn speech into text | Google Gemini with your own key, which is the only speech-to-text provider supported. Not stored. |
| Companion settings (on/off, sound, hidden sites, icon position for each site) | To remember your preferences | Local extension storage only. |
If you use a model server on your own computer (for example, LM Studio or Ollama), page content does not leave your machine. If you use a cloud provider, that provider's own privacy policy and terms apply to the data the extension sends it.
Optional integrations
- Muon macOS app: when installed, it can open the extension's panel with a task. The task text is handled the same way as one you type.
- browser-use engine (off by default): when you turn it on in Settings, the task text and starting URL are passed through Chrome native messaging to a helper program you installed on your own computer. The extension sends nothing to the developer.
Analytics / telemetry
The source code includes an optional anonymous usage-analytics module (PostHog). It is off by default and only works if two things are true: a PostHog project key was built into the extension, and you turn analytics on in Settings > Analytics.
The release build is built without an analytics key, so it sends no analytics, even if you turn the setting on.
(For reference, if it were ever enabled, it would send only: a random anonymous ID, task started/completed/failed/cancelled events with duration and an error category, and the domain names of visited sites. It would never send page content, prompts, keys or full URLs.)
What the developer does not do
- No developer-run servers, accounts or sign-in.
- No sale or transfer of user data to third parties.
- No use of data for advertising, creditworthiness or lending decisions, or anything unrelated to the extension's single purpose.
- No remotely hosted code.
Your control
- Delete chat history in the side panel, and delete workflows in the workflow panel.
- Remove API keys in Settings.
- Uninstalling the extension deletes all of its local data.
Children
The extension is not directed at children under 13.
Changes
Changes to this policy will be posted at this URL and in the repository.
Contact
Open an issue at https://github.com/harshdvaid24/muon-browser-agent/issues