browser-sanity

Browser Sanity — Privacy Policy

Last updated: May 8, 2026

Browser Sanity is a Chrome extension that helps you close duplicate tabs and tab groups that have been marked complete. This policy explains exactly what data the extension touches and what it does not.

TL;DR

• The extension reads tab and tab-group information only inside your browser, only when you click its button.
• It does not transmit, sell, share, or store any browsing data on any external server.
• It does not collect analytics, telemetry, or tracking data of any kind.
• Your settings are stored locally in Chrome’s built-in chrome.storage.sync, which Chrome may sync across your own devices via your Google account. The extension developer never sees this data.

What data the extension accesses

To do its job, the extension reads the following from your browser when you click “Clean tabs” or “Preview”:

• Tab URLs and titles — to detect duplicates (exact, near-duplicate, and same-domain).
• Tab group titles — to detect groups marked with the “task done” marker (✅).
• Tab metadata — lastAccessed time, pinned status, audible status, active status — so the extension knows which tab in each duplicate group to keep, and which tabs to protect.
• Group membership — which tab belongs to which tab group.

This data is read in memory and used only for the immediate cleanup decision. It is never logged, stored beyond the active operation, or sent anywhere.

What the extension stores

The extension persists a small amount of information using Chrome’s standard storage APIs:

• Settings — your rule toggles, allowlist domains, group allowlist, staleness thresholds, and complete-marker characters. Stored in chrome.storage.sync, which means Chrome may sync them across your devices via your Google account.
• Last-run summary — the count and breakdown of tabs closed in your most recent cleanup run. Stored in chrome.storage.local so the popup can display it. This contains only counts, not URLs.

Neither of these stores leaves Chrome’s built-in storage. The extension developer has no access to either.

What the extension does NOT do

• It does not connect to any server, ever.
• It does not include analytics, error reporting, or telemetry SDKs.
• It does not read content inside web pages (no content_scripts, no DOM access).
• It does not access cookies, passwords, browsing history, downloads, or bookmarks.
• It does not modify any web page.
• It does not display ads.
• It does not sell or share any data with anyone.

Permissions the extension requests, and why

• tabs — required to read tab URLs/titles and to close tabs. Without this, the extension cannot identify or close duplicates.
• tabGroups — required to read tab group titles to identify groups Claude has marked ✅ done.
• storage — required to save your settings (allowlists, thresholds, rule toggles).

Children

The extension is not directed at children under 13. It does not knowingly collect any data from anyone — children or adults.

Changes to this policy

If this policy ever changes, the updated version will be posted at the same URL with a new “Last updated” date. The extension will continue not to transmit any data.

Contact

For questions or concerns about this policy, email alex@fiatgrowth.com.