Locale Switcher

Name: Locale Switcher
Rating: 4.5 (10 reviews)
Author: Locale Switcher

By: Locale Switcher

Lets you quickly switch the browser locale to test localization on your website.

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Features & Capabilities

Locale Switcher Chrome Extension

Locale Switcher is a powerful browser extension designed for developers and testers to quickly change their browser locale and test website localization effortlessly. It modifies the navigator.language, navigator.languages, and Accept-Language headers to simulate different language settings.

Key Features

Compatible with Chrome and Firefox browsers
Supports over 700 languages and variations
Locale changes applied on a per-tab basis
Ability to favorite your most used locales for quick access
Fully keyboard shortcut enabled (Windows: Ctrl+Shift+L, Mac: Cmd+Shift+L), no mouse required

The extension requires permissions to alter web traffic headers and access tabs to manipulate language properties. Locale Switcher is open-source and maintained actively under the MIT License, making localization testing smoother and more efficient for developers.

User Growth & Download Statistics

Add-on Developer Tools

By:

Daily users:

Rating:

Version:

1.3.0 Last updated: 2025-03-01

Version code:

5901904

Creation date:

2022-01-10

Risk:

Permissions:

Content scripts matches:

<all_urls>

Size:

106.98KB

Email:

lo*****@googlegroups.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-19

Compare stats and ranking:

Ranking

# 2,234 ▼ 1

Other rankings

#249 in Web Development

#7 in kitchen keyword 2 ▲ 1

#28 in pitch keyword 35 ▲ 1

#31 in switch keyword 28 ▼ 1

#50 in license keyword 8

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Other platforms

Locale Switcher (v1.3.1)

50,000 4.41

(79)

For Developers

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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:

Locale Switcher

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/locale-switcher/

Email:

lo*****@googlegroups.com

Website:

https://github.com/locale-switcher

Permission Change History

2025-03-01: Version 1.2.5 → 1.3.0

Add Permissions: declarativeNetRequest activeTab scripting

Remove Permissions: webRequest webRequestBlocking

User Reviews

by Fi*****, 2026-03-03

Does exactly what it says, and has a great UI as well.

by fe*****, 2026-02-24

Strange user-interface. Like in Brave (Chrome), the add-on only works on pages loaded via http(s), not on locally stored pages that you want to test under changed conditions prior upload. But different from Brave, where just nothing happens, trying to switch the navigator-language on local files may seriously bedazzle Firefox... I saw a page continuously reloaded and languages switched without me even touching the mouse ... makes you dizzy.

by Bo*****, 2025-12-31

View all user reviews ›

Is Locale Switcher 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.

Locale Switcher requires a few sensitive permissions. Exercise caution before installing.

Risk impact analysis details

Critical Allows access to all websites, posing a significant security risk as it can monitor and modify data from any visited site.
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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.

Locale Switcher has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

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