Close New Duplicate Tabs

Name: Close New Duplicate Tabs
Rating: 5 (2 reviews)
Author: Sunfur

By: Sunfur

Closes a newly created tab if tab with the same URL is already open. Does not destroy your old tabs if you accidentally open a duplicate URL.

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Features & Capabilities

This open-source extension helps you to stop accidentally opening the same webpage twice and cluttering your tabs bar. It automatically detects and closes a newly created tab if its URL is already open in another tab, reducing memory usage and keeping your tab bar clean.

Unlike other extensions with similar functionality, this one works on newly created tabs, meaning that you wont lose tabs with history. It still enables you to close all duplicate tabs through the context menu if you have some left over, though.

This extensions behaviour can also be customized extensively in the extension options - if you want it to, it can even ignore search strings in URLs for duplicate checking or redirect your focus when a duplicate gets closed.

User Growth & Download Statistics

Add-on

By:

Sunfur

Daily users:

82 4

Rating:

5.00

(2)

Version:

2.1 Last updated: 2026-03-02

Version code:

6167457

Creation date:

2025-11-09

Risk:

Permissions:

Size:

16.77KB

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-21

Compare stats and ranking:

Ranking

# 12,513 ▲ 293

Other rankings

#62 in close keyword 20 ▲ 1#213 in new tab keyword 49 ▲ 5#215 in new tabs keyword 40 ▲

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

Sunfur

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/close-new-duplicate-tabs/

Website:

https://github.com/sonnenfell/firefox-new-duplicate-tab-closer

Permission Change History

2026-03-03: Version 2.0 → 2.1

Add Permissions: menus

2026-02-16: Version 1.0 → 2.0

Add Permissions: storage

User Reviews

by Fi*****, 2026-02-27

Works well. It would be nice to have an option to make it work in another way, so that the new tab is opened next to the current tab, while the old one gets closed.

by Fi*****, 2026-01-14

View all user reviews ›

Is Close New Duplicate Tabs Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Close New Duplicate Tabs requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Close New Duplicate Tabs is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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