What does Duplicate Tab Closer do?

Duplicate Tab Closer focuses on closing duplicate browser tabs manually across multiple windows. It is catalogued under Browser DevTools & extensions on PulseGate.

Who is Duplicate Tab Closer for?

Duplicate Tab Closer is a consumer product built for firefox users who manage many browser tabs.

Does Duplicate Tab Closer have a free plan?

Yes — Duplicate Tab Closer is free to use.

What platforms does Duplicate Tab Closer run on?

Duplicate Tab Closer runs on the web and embeddable surfaces.

Is Duplicate Tab Closer still maintained?

Unverified. Duplicate Tab Closer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.

What projects are similar to Duplicate Tab Closer?

Similar projects tracked by PulseGate include Duplicate Tab Closer, Duplicate Tab Detector, and Close New Duplicate Tabs.

Who develops Duplicate Tab Closer?

Duplicate Tab Closer is developed by Simple Tasks.

When did Duplicate Tab Closer launch?

Duplicate Tab Closer first shipped in 2024.

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Duplicate Tab Closer

Name: Duplicate Tab Closer
Author: Simple Tasks

mozilla.orgBrowser DevTools & extensions

Duplicate Tab Closer is a Firefox browser extension that finds and closes tabs with completely identical URLs across browser windows. Users can run it separately in regular and private windows from the toolbar.

FreeWebEmbeddable

Visit mozilla.org

5alternatives

6features

2024since

Overview

6 features

In the Browser DevTools & extensions space, Duplicate Tab Closer takes a focused approach. It focuses on closing duplicate browser tabs manually across multiple windows. It is built as a consumer product for firefox users who manage many browser tabs. Duplicate Tab Closer costs nothing to use. Duplicate Tab Closer is available on the web and embeddable surfaces.

Simple Tasks builds and maintains Duplicate Tab Closer, and it first shipped in 2024. PulseGate's similarity index places it among 5 comparable projects. Among its 6 catalogued features are duplicate tab closing, cross-window scanning, and private-window support. The interface is available in 32 languages, including Czech, German, and Greek.

Summary written by a language model from the project’s public pages.

Duplicate tab closing
Cross-window scanning
Private-window support
Toolbar button
URL matching
No data collection

Built with & integrations

Runs on

BrowserEmbeddable

Trust & compliance

Verified signals

HTTPSPrivacy Policy Terms of ServiceFree tierMulti-languageStore-verified publisher

Legal

Indexing history

What PulseGate has recorded for this listing

Indexed14 Sep · 09:49 UTC
Duplicate Tab Closer verified via Firefox Add-ons
Source: Firefox Add-ons · Open

Frequently asked questions about Duplicate Tab Closer

What does Duplicate Tab Closer do?: Duplicate Tab Closer focuses on closing duplicate browser tabs manually across multiple windows. It is catalogued under Browser DevTools & extensions on PulseGate.
Who is Duplicate Tab Closer for?: Duplicate Tab Closer is a consumer product built for firefox users who manage many browser tabs.
Does Duplicate Tab Closer have a free plan?: Yes — Duplicate Tab Closer is free to use.
What platforms does Duplicate Tab Closer run on?: Duplicate Tab Closer runs on the web and embeddable surfaces.
Is Duplicate Tab Closer still maintained?: Unverified. Duplicate Tab Closer has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
What projects are similar to Duplicate Tab Closer?: Similar projects tracked by PulseGate include Duplicate Tab Closer, Duplicate Tab Detector, and Close New Duplicate Tabs.Duplicate Tab Closer Duplicate Tab Detector Close New Duplicate Tabs
Who develops Duplicate Tab Closer?: Duplicate Tab Closer is developed by Simple Tasks.
When did Duplicate Tab Closer launch?: Duplicate Tab Closer first shipped in 2024.

At a glance

Pricing: Free
Platforms: Web
Built for: Firefox users who manage many browser tabs
Model: B2C
Solves: Closing duplicate browser tabs manually across multiple windows.

Registered as

Firefox Add-ons: duplicate-tab-closer

Developer

Simple Tasks

Index record

Indexed: 14 Sep 2026
Lifecycle: Alive
Last seen: 14 Sep 2026

Identity audit (13)

Slug: duplicate-tab-closer-mozilla-org-16u6lk
Lifecycle state recorded: 14 Sep 2026
Verification state: Indexed for public listing
Listing state: Listed: yes
Index status: Included in index
Latest evidence snapshot: 14 Sep 2026
Timeline basis: Indexed-at chronology. This listing's first-seen date was written by the catalog backfill, not observed here, so it is not treated as a sighting.
Name from: Derived from the project's own page and URL.
Category from: Assigned by a language model.
Summary from: Written by a language model from public pages.
Languages from: Detected by a language model, checked against the page's own declaration.
Last updated: 14 Sep 2026
Canonical URL: https://addons.mozilla.org/en-US/firefox/addon/duplicate-tab-closer

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