# User-Agent Switcher and Manager

> Spoof websites trying to gather information about your web navigation—like your browser type and operating system—to deliver distinct content you may not want.

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

## Overview

- **ID:** `user-agent-string-switcher`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Ray
- **Category:** web-development,privacy-security
- **Daily users:** 84,524
- **Weekly downloads:** 3,158
- **Rating:** 4.08 / 5 (782 ratings)
- **Version:** 0.7.1
- **Last updated:** 2026-09-01
- **First published:** 2017-09-13
- **Size:** 872 KB
- **Data as of:** 2026-09-05
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/user-agent-string-switcher/)
- **Website:** [https://webextension.org/listing/useragent-switcher.html](https://webextension.org/listing/useragent-switcher.html)

## Description

User-Agent Switcher and Manager lets you spoof your browser "user-agent" string to appear as a different browser, OS, or device. Use it to load mobile site versions for speed, test site behavior across browsers, or reduce tracking and content tailoring by masking identifying details. Quick toolbar controls make switching immediate and simple.

Features include per-site and per-window user-agent settings, an option to randomize user-agent strings, and a two-factor mimic technique for reliable spoofing. The extension supports modern identification methods (Client Hints and navigator.userAgentData), lets you exclude domains, and uses no resources when not actively spoofing. Ideal for developers, privacy-conscious users, and anyone who wants consistent, customizable browsing behavior.

## Rankings

- #244 — Overall
- #7 — Web Development
- #15 — Privacy & Security
- #1 — agenda
- #1 — agent
- #1 — deliver

## Permissions and access

### Permissions

- `storage`
- `contextMenus`
- `scripting`
- `declarativeNetRequestWithHostAccess`
- `webRequest`

### Host permissions

- `<all_urls>`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** Very low 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 was recently updated in the past month. New updates 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

User reviews for the Firefox add-on show a split experience. A few users found it very useful and rated it among the best UA switchers, especially when it worked and could outperform alternatives on some sites. However, the majority report reliability problems: the extension frequently stops functioning across updates and Firefox versions, and it can break YouTube playback and Google searches, sometimes prompting captchas. Compatibility issues are common, including broken whitelist/containers features and failures on newer Firefox forks. Overall, while it can be helpful in narrow use cases, its reliability and ongoing support are major concerns.

### Pros

- When it worked, it was very useful and praised as one of the best UA switchers.
- It performed well compared to other UA switchers and could fool some sites.
- It still had value in scenarios that don't require up-to-date user agents.

### Cons

- Frequently stops working or becomes non-functional across updates and Firefox versions.
- Breaks YouTube playback after a short time, causing the player to stop or crash.
- Disrupts Google search and can trigger captchas.
- Compatibility issues: broken whitelist/containers features, failures on newer Firefox forks, and removal of per-container UA assignment.
- Poor reliability on Android and in general.

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