# TabOnce

> TabOnce focuses an existing matching tab instead of opening a duplicate. You choose exactly which sites and URL patterns it applies to.

Canonical page: [https://chrome-stats.com/d/tabonce](https://chrome-stats.com/d/tabonce)

## Overview

- **ID:** `tabonce`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** dorian
- **Category:** tabs
- **Weekly downloads:** 1
- **Version:** 1.2.0
- **Last updated:** 2026-08-30
- **First published:** 2026-08-11
- **Size:** 50 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/tabonce/)
- **Website:** [https://github.com/dkarter/tab-once](https://github.com/dkarter/tab-once)

## Description

TabOnce keeps duplicate tabs under control without affecting every page you visit.

Create opt-in rules for the websites and URL patterns that should only have one matching tab open. When TabOnce detects a duplicate, it closes the new tab and focuses the existing one instead.

Rules can:
  - Match literal or variable path segments
  - Treat deeper paths as the same page
  - Include or ignore query strings and fragments
  - Be enabled, disabled, and reordered
  - Optionally intercept same-site links when the destination is already open

For example, different views of the same GitHub pull request can share one tab, while separate pull requests remain distinct.

Site access is requested separately for each configured origin. TabOnce is fully open-source, and does not collect or transmit any personal data.

Review the full source code at <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/80ee57c475d7cecddbe524faae4fde3507e7b4ba93fba1e3f979e7169719875c/https%3A//github.com/dkarter/tab-once" rel="nofollow">https://github.com/dkarter/tab-once</a>

## Rankings

- #134,551 — Overall
- #210 — fragment

## Permissions and access

### Permissions

- `scripting`
- `storage`
- `tabs`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [New Tab Dedupe](https://chrome-stats.com/d/%E6%96%B0%E6%A0%87%E7%AD%BE%E9%A1%B5%E5%8E%BB%E9%87%8D) — 17 users
- [Sticky TabSZ](https://chrome-stats.com/d/sticky-tabsz) — 3.00 / 5
- [Tab Reuser](https://chrome-stats.com/d/tab-reuser) — 7 users
- [Tab Options - Open source](https://chrome-stats.com/d/tab-options-open-source) — 4 users, 4.00 / 5
- [Live Tab Deduplication](https://chrome-stats.com/d/live-tab-deduplication)
- [SmartTab Organizer](https://chrome-stats.com/d/smarttab-organizer)
- [Close Tabs By Pattern](https://chrome-stats.com/d/close-tabs-by-pattern) — 22 users, 5.00 / 5
- [Auto Tab Grouping](https://chrome-stats.com/d/auto-tab-grouping-v1) — 47 users, 4.30 / 5
- [Automatic Tab Group Organizer](https://chrome-stats.com/d/automatic-tab-group-organizer) — 1 users
- [Smart Prevent Duplicate Tabs](https://chrome-stats.com/d/smart-prevent-duplicate-tabs) — 348 users, 4.00 / 5
- [Tab Deduplicator](https://chrome-stats.com/d/tab-deduplicator) — 3 users, 3.00 / 5
- [Tabglutton](https://chrome-stats.com/d/tabglutton)

---

Source: [Chrome-Stats](https://chrome-stats.com/d/tabonce)