# Custom UserAgent String

> Add a custom useragent string for desired URLs or domains.

Canonical page: [https://chrome-stats.com/d/custom-user-agent-revived](https://chrome-stats.com/d/custom-user-agent-revived)

## Overview

- **ID:** `custom-user-agent-revived`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Linder
- **Category:** privacy-security,appearance,tabs
- **Daily users:** 897
- **Weekly downloads:** 27
- **Rating:** 3.53 / 5 (38 ratings)
- **Version:** 0.2.5
- **Last updated:** 2026-06-10
- **First published:** 2017-02-13
- **Size:** 538 KB
- **Data as of:** 2026-09-08
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/custom-user-agent-revived/)
- **Website:** [https://mybrowseraddon.com/custom-useragent-string.html](https://mybrowseraddon.com/custom-useragent-string.html)

## Description

**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.

## Rankings

- #3,489 — Overall
- #333 — Tabs
- #2 — string
- #14 — agent
- #27 — agenda
- #27 — customer

## Permissions and access

### Permissions

- `storage`
- `declarativeNetRequest`

### Host permissions

- `*://*/*`
- `ws://*/*`
- `wss://*/*`

### Content script matches

- `*`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

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

## Similar extensions and apps

- [User-Agent Switcher](https://chrome-stats.com/d/user-agent-switcher-revived) — 14,031 users, 3.93 / 5
- [User Agent Modifier](https://chrome-stats.com/d/user-agents-modifier) — 3 users
- [User Agent Switcher](https://chrome-stats.com/d/ua-switcher) — 355 users, 4.48 / 5
- [User-Agent Switcher and Manager](https://chrome-stats.com/d/user-agent-string-switcher) — 83,517 users, 4.08 / 5
- [User-Agent Modifier](https://chrome-stats.com/d/user-agent-modifier) — 7 users, 5.00 / 5
- [Advanced User-Agent](https://chrome-stats.com/d/advanced-user-agent) — 4 users
- [Change User-Agent](https://chrome-stats.com/d/change-user-agent) — 102 users, 3.50 / 5
- [User agent override](https://chrome-stats.com/d/user-agent-override) — 8 users, 1.00 / 5
- [User-Agent Swithcer](https://chrome-stats.com/d/custom-user-agent-swithcer) — 4.87 / 5
- [User-Agent Header Manager](https://chrome-stats.com/d/user-agent-header-manager) — 1 users
- [User Agent Switcher – Change & Manage](https://chrome-stats.com/d/user-agent-switcher-change) — 3 users
- [User Agent Switcher](https://chrome-stats.com/d/user_agent_switcher) — 1 users

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Source: [Chrome-Stats](https://chrome-stats.com/d/custom-user-agent-revived)