# Window Merger

> Merge specified browser windows into each other. Or all of them into one. Simply right click to open Firefox’s context menu when multiple windows are open, or configure a keyboard shortcut. All wrapped up in one tiny free extension.

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

## Overview

- **ID:** `window-merger`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Martijn
- **Category:** tabs
- **Daily users:** 729
- **Weekly downloads:** 14
- **Rating:** 5.00 / 5 (17 ratings)
- **Version:** 0.7.3
- **Last updated:** 2026-06-20
- **First published:** 2019-08-31
- **Size:** 24 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/window-merger/)
- **Website:** [https://github.com/Zegnat/browserext-window-merger/issues](https://github.com/Zegnat/browserext-window-merger/issues)

## Description

Window Merger is designed to merge browser windows efficiently—either all at once or selectively—using a right-click Firefox context menu or configurable keyboard shortcuts. It focuses on window merging, while offering user-friendly options such as private-window safety, dark-mode integration, and a clean Extensions page experience.

The design emphasizes doing one thing well and staying accessible. It supports private windows merging, avoids mixing private and non-private spaces, is tested for ESR Firefox versions, and aligns with Linux workflows. It also references related tab-management extensions for users who want more options.

## Rankings

- #4,025 — Overall
- #24 — member
- #31 — windows
- #74 — configure
- #169 — choice

## Permissions and access

### Permissions

- `tabs`
- `menus`
- `storage`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate 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 has low user count. Unpopular extensions 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).

## Review summary

Users find Window Merger to be a simple, fast, and effective add-on that helps merge browser windows efficiently, especially valued by heavy tab users. Many praise its functionality and keyboard shortcut support. However, some users experience difficulty locating the add-on's interface or understanding its options, indicating a need for clearer guidance or documentation.

### Pros

- Effectively merges multiple browser windows, including the ability to merge just two windows rather than all.
- Simple, slim, and fast functionality with keyboard shortcut support.
- Highly appreciated by users who manage many tabs at once, providing better tab organization.
- Outstanding performance on multiple browsers including Firefox Quantum and Waterfox Classic.
- Easy to use via right-click on any tab.

### Cons

- Some users have difficulty locating the add-on's interface, options, or buttons, with confusion about where to access features.
- Lack of clear instructions or guidance on how to use the extension's options leads to user uncertainty.

## Similar extensions and apps

- [Window Merger](https://chrome-stats.com/d/window-merger34) — 12 users
- [Merge Windows advance](https://chrome-stats.com/d/merge-windows-advance) — 1 users
- [Merge Windows (Zen Browser compatible)](https://chrome-stats.com/d/simple-merge-windows) — 5 users, 5.00 / 5
- [Merge Windows Plus](https://chrome-stats.com/d/merge-windows-plus) — 1 users
- [SM Merger](https://chrome-stats.com/d/sm-merger)
- [Tab Merger](https://chrome-stats.com/d/tab-merger) — 47 users, 5.00 / 5
- [Merge Windows](https://chrome-stats.com/d/merge-window) — 2,477 users, 4.63 / 5
- [Merge Windows](https://chrome-stats.com/d/merge-windowsss)
- [Merge Windows](https://chrome-stats.com/d/merge-windowsssd) — 1 users
- [Merge Windows](https://chrome-stats.com/d/merge-windowsioe) — 1 users
- [Merge Windows](https://chrome-stats.com/d/merge-windowses) — 1 users
- [SA Merge](https://chrome-stats.com/d/sa-merge)

---

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