User-Agent Switcher and Manager Firefox

User-Agent Switcher and Manager

By: Ray Add-on
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.

Overview

Firefox Add-ons Store
Daily users
82,967 ▼ 725
Data as of 2026-07-27
Rating:
4.06
(785)
Version:
0.6.7
Last updated: 2026-04-24
Download
Ranking
#243
Overall
Category rank
#7
Web Development

Features & Capabilities

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.

User Growth & Download Statistics

Manifest V3 Add-on Privacy & Security Developer Tools
By:
Ray
Daily users:
82,967 -725
Rating:
4.06
(785)
Version:
0.6.7 Last updated: 2026-04-24
Version code:
6229496
Creation date:
2017-09-13
Risk:
Moderate risk impact Very low risk likelihood
Permissions:
Host permissions:
  • <all_urls>
Size:
866.08KB
URLs:
Website
Full description:
See detailed description
Source:
Firefox Add-ons Store
Data ingested on:
2026-07-27
Compare stats and ranking:

Ranking

# 243
Other rankings
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Other platforms

Chrome
User-Agent Switcher and Manager (v0.6.7)
300,000 4.33 (271)
Edge
User-Agent Switcher and Manager (v0.6.7)
196,765 4.50 (30)

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:
Ray
Firefox Add-ons Store
https://addons.mozilla.org/firefox/addon/user-agent-string-switcher/
Website:
https://webextension.org/listing/useragent-switcher.html

Permission Change History

2026-04-24: Version 0.6.6 → 0.6.7
Add Permissions: webRequest
2025-05-27: Version 0.5.0 → 0.6.5.1
Add Host permissions: <all_urls>
Add Permissions: scripting declarativeNetRequestWithHostAccess
Remove Permissions: <all_urls> webNavigation webRequest webRequestBlocking
Remove Optional permissions: cookies

User Reviews

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.
Recent reviews
Was having issues with youtube not showing the subscription feed & learned that changing the size to only show 1 video result usually fixes the issue by forcing the site to use the mobile version. The issue was that I had to keep changing the size to see the results for that trick. so I thought about using a user agent switcher addon as a workaround but I wanted 1 that only worked on that page somehow so the addons/scripts I have still work on the watch pages & the 1 I had installed did not have any way to do that. I found this 1 which allows me to set that tab to load as an android so I can open the video results in a new tab & achieve the goals I was after. Amazing & I may simply use this workaround forever because it removed the shorts & other crap from the feed for me lol.
by le*****, 2026-07-19
An indispensable asset in Firefox. It’s a huge lifesaver for testing responsive layouts across different platforms and helps bypass websites that artificially restrict access for Firefox users. A huge plus for the ability to configure custom strings and setup automatic rotation.
by eb*****, 2026-07-08
View all user reviews ›

Is User-Agent Switcher and Manager 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.

User-Agent Switcher and Manager 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.

User-Agent Switcher and Manager has earned a good reputation and 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.
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