Tabtwinsy — Privacy Policy

Last updated: 8 August 2026

In one line: Tabtwinsy works entirely on your own computer. It reads your open tabs only to mirror them across your browser windows, stores that locally, and never sends any of your data to us or to anyone else.

What the extension does

Tabtwinsy keeps the same set of tabs and tab groups mirrored across all of your normal browser windows. To do this it needs to see which tabs are open in each window and recreate that set in the others.

What it accesses, and why

Tab information (URLs, titles, and tab-group names) — read via the tabs and tabGroups permissions, solely to know what tabs and groups you have open so they can be mirrored to your other windows.
Local storage (storage permission) — a small record of the current tab set is kept in your browser's local extension storage so mirroring stays consistent across sessions.
Alarms (alarms permission) — a periodic timer used to re-check for changes. It processes no personal data.

Where your data goes

Nowhere. Tabtwinsy has no servers and makes no network requests. Your tab data never leaves your device.
No analytics, no tracking, no advertising, no third-party services.
Nothing is sold, shared, or transmitted.
Incognito / private windows are ignored entirely — they are never read, mirrored, or modified.

Data retention

The only data stored is the current tab set, in your browser's local extension storage on your device. It is overwritten as your tabs change and is removed when you uninstall the extension. You can also clear it at any time by removing the extension.

Changes to this policy

If this policy changes, the updated version will be posted at this URL with a new "last updated" date.