Close Duplicate Sites

Name: Close Duplicate Sites
Author: Mikhail Danshin

Closes duplicate tabs for the same site (eTLD+1), keeping the active tab. Works via toolbar button and tab context menu.

Overview

Firefox Add-ons Store

Daily users

Data as of 2026-07-29

Version:

1.1.1

Last updated: 2026-01-14

Features & Capabilities

Close Duplicate Sites helps you quickly clean up duplicate tabs.

What it does

Treats all subdomains as the same site using the base domain (eTLD+1), e.g. mail.google.com → google.com.
Keeps the active tab for that site and closes the rest.
Keeps pinned tabs (safety default).

How to use

Click the toolbar button to close duplicates for the current site in the current window.
Or right-click a tab to run:
- close duplicates for this site (current window),
- close duplicates for all sites (current window / all windows).

Privacy

No tracking, analytics, or data collection.
The add-on downloads the Public Suffix List from publicsuffix.org to correctly detect the base domain and caches it locally.

User Growth & Download Statistics

Add-on

By:

Mikhail Danshin

Daily users:

Version:

1.1.1 Last updated: 2026-01-14

Version code:

6118059

Creation date:

2026-01-11

Risk:

Permissions:

tabs
menus
storage
alarms
https://publicsuffix.org/list/public_suffix_list.dat

Size:

11.07KB

Email:

md*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-29

Compare stats and ranking:

Ranking

# 66,857 ▼ 249

Other rankings

#184 in close keyword 21 ▲ 2

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:

Mikhail Danshin

Firefox Add-ons Store

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

Email:

md*****@gmail.com

Website:

https://danshin.ms/cds

Is Close Duplicate Sites 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 Duplicate Sites 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.
Low ******* ****** ** *** ********* ******** ****************

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 Duplicate Sites 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.
Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****