User-Agent Switcher

Name: User-Agent Switcher
Rating: 4.3694 (536 reviews)
Author: ntninja

Easily override the browser's User-Agent string

Download

Install Compare

User-Agent Switcher is a powerful Chrome extension that allows you to easily override your browser's User-Agent string. This means you can impersonate different browsers or devices to access web pages under various conditions, such as bypassing subscription walls, testing mobile versus desktop views, or accessing sites that require a specific browser.

The extension also modifies related navigator.* JavaScript properties to ensure a convincing emulation. While it doesn't modify the browser's core functionalities, it helps you test and navigate websites under different user-agent settings. User-Agent Switcher includes a robust database and tools to generate accurate User-Agent strings and works across platforms, including Firefox for Android. The extension is in maintenance mode, with community contributions welcomed, and it encourages translation contributions to support international users.

Add-on Developer Tools Privacy & Security Productivity

By:

ntninja

Daily users:

62,140 2.23K

Rating:

4.37

(536) 2 new ratings

Version:

1.4.89 Last updated: 2025-03-11

Version code:

5905576

Creation date:

2017-05-06

Risk:

Permissions:

storage
tabs
webNavigation
webRequest
webRequestBlocking
<all_urls>

Size:

4.24MB

Email:

us*****@ninetailed.ninja

URLs:

Website

Full description:

Source:

Firefox Browser Add-ons

Data ingested on:

2025-07-07

Ranking

# 274 ▲ 7

Other rankings

#26 in Web Development

#66 in Privacy & Security ▲ 2

#2 in agent keyword 58

#3 in kitchen keyword 1

#4 in agenda keyword 20

Upgrade to see more rankings

Publisher Change History

2024-07-30: Email was changed from us*****@ninetailed.ninja to us*****@ninetailed.ninja

Upgrade to see full email

User reviews

User-Agent Switcher is valued for enabling access to sites that restrict Firefox users by spoofing user agents and permitting domain-specific customization. However, multiple users report issues with the per-site filtering feature not working correctly, causing user agents to apply globally. It struggles to bypass detection on platforms like Netflix and Cloudflare, and occasionally causes crashes on Firefox mobile. Despite these limitations, it remains one of the more reliable user agent switcher extensions available, improving usability on problematic sites.

Pros

Effectively allows users to spoof their user agent to access sites that restrict or block Firefox, such as Roblox and certain login pages.
Enables applying custom user agents to specific domains, offering some level of site-specific customization.
Generally reliable as a user agent switcher compared to alternatives.
Helps improve user experience on sites like Facebook by enabling mobile user agents, making sites more tolerable to use.

Cons

The 'only for this site' feature doesn't work as expected, applying user agent changes globally rather than per site, causing UX issues.
It fails to bypass some modern detection methods, e.g., Netflix and Cloudflare security checks still detect the real user agent or block access.
Can cause instability or crashes in Firefox mobile in some cases.
Does not completely fool all websites, with some sites still detecting the original browser user agent string.

Recent reviews

doesnt keep itself isolated using "only for this site" pref. Apparently it enables selected UA for *all* sites, and for ones you didn't want you have to opt-out... Not best UX

by No*****, 2025-07-05

by se*****, 2025-07-02

by Tu*****, 2025-06-27

View all user reviews ›

Extension safety

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.

User-Agent Switcher requires some sensitive permissions that could impact your browser and data security. 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.
Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
High ****** *** ********* ** ******* *** ******* ******* ** ****** *** *** ******** ******
High ****** ********* ** * ****** ******** ******** ********** * ******* ******* *****

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 Browser Add-ons, 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.

User-Agent Switcher has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

Low This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.
Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
Low **** ********* *** **** **** ****** ******* ********** **** ****** ** ** ****** *** *****
Good **** ********* *** **** **** *******

Upgrade to see full risk analysis details

Instantly check and monitor your browser extensions' risks and permissions with Extension Guard.