Custom UserAgent String

Name: Custom UserAgent String
Rating: 3.5676 (37 reviews)
Author: Linder

By: Linder

Add a custom useragent string for desired URLs or domains.

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Install

Features & Capabilities

Custom UserAgent String is a powerful Chrome extension that allows you to customize your browser's user-agent string on a per-URL or per-domain basis. Through its user-friendly Options page, you can add, edit, or disable custom user-agent strings tailored to specific websites.

Key features include an ON/OFF toggle in the toolbar popup for quick enabling or disabling, the ability to switch URLs to domains for broader application, and a comprehensive sample list of over 100 modern user-agent strings spanning desktop and mobile platforms. This makes it easy to simulate different browsers or devices effortlessly. For troubleshooting or bug reporting, visit the addon's homepage. Whether for web testing, development, or privacy, this extension provides flexible user-agent customization with simple controls.

User Growth & Download Statistics

Add-on

By:

Linder

Daily users:

966 1

Rating:

3.57

(37)

Version:

0.2.5 Last updated: 2026-06-10

Version code:

6300342

Creation date:

2017-02-13

Risk:

Permissions:

Host permissions:

*://*/*
ws://*/*
wss://*/*

Content scripts matches:

Size:

538.09KB

Email:

dr*****@yahoo.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-18

Compare stats and ranking:

Ranking

# 3,297 ▲ 5

Other rankings

#311 in Tabs ▼ 1

#2 in string keyword 10

#13 in agent keyword 65 ▲ 1

#24 in agenda keyword 30

#26 in customer keyword 12 ▲ 1

Upgrade to see more rankings

Other platforms

Custom UserAgent String (v0.2.5)

30,000 3.84

(37)

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:

Linder

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/custom-user-agent-revived/

Email:

dr*****@yahoo.com

Website:

https://mybrowseraddon.com/custom-useragent-string.html

Permission Change History

2025-04-06: Version 0.2.1 → 0.2.4

Add Host permissions: *://*/* ws://*/* wss://*/*

Add Permissions: declarativeNetRequest

Remove Permissions: *://*/* ws://*/* wss://*/* webRequest webRequestBlocking

User Reviews

Users highlight strong, fine-grained UA control (per-domain/URL spoofing) and powerful customization options, with many noting it works well on desktop and can be simple for basic use. Common downsides include Android incompatibility, frequent Discord login issues after updates, missing wildcard support for URL patterns, and a cumbersome UI that makes activation and rule management awkward. These patterns show a tool that's valuable for power users when it works, but less reliable and harder to use for mobile or newcomers.

Pros

Fine-grained per-domain/URL UA spoofing, giving precise control over which sites see which UA strings.
Very powerful and flexible UA customization options (platform/OS/browser selection) for advanced users.
Generally reliable on desktop and simple for basic use.
Simple and sweet for straightforward UA changes.

Cons

Android compatibility issues: not working on Firefox for Android / cannot install on Android.
Discord login problems after updates: blank screen on login unless the extension is disabled or rolled back.
Lack of wildcard support for URL patterns, making it hard to cover all subdomains with a single rule.
Cumbersome UI and activation challenges: manual address entry instead of per-page enablement, long options UI.

Recent reviews

by Fi*****, 2025-12-15

This one is saving my life when using office web.. it's sad to see office web forcing edge to be used... I really love this extension. Thank you

by Be*****, 2025-07-22

I love this extension, but I had to roll it back to 0.2.1 for Discord to work. Something broke.

by Ni*****, 2025-04-17

View all user reviews ›

Is Custom UserAgent String 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.

Custom UserAgent String 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.

Custom UserAgent String is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

Risk likelihood analysis details

High This extension was recently updated in the past month. New updates may not be stable or safe.
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Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
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