User-Agent Auto Spoofer

Name: User-Agent Auto Spoofer
Author: Chris Judevine

By: Chris Judevine Add-on

Assign custom, site-specific User-Agent overrides (Desktop, Mobile, or Web Crawler).

Overview

Firefox Add-ons Store

Daily users

2 ▼ 1

Data as of 2026-07-26

Version:

1.0.1

Last updated: 2026-07-15

Features & Capabilities

Per-Site User-Agent Switcher & Spoofer puts you in complete control over how websites perceive your browser and device environment. Instead of forcing a blanket, global identity change that breaks half the web, this extension uses a granular rules system to inject targeted headers and window overrides on a strict per-site basis.

Simply add a domain, assign its target profile, and browse seamlessly.

8 Built-In Profiles Supported:

Desktop Browsers: Firefox Desktop, Google Chrome, Microsoft Edge, Safari Desktop

Mobile Browsers: Android Firefox, Android Chrome, Safari Mobile (iPhone)

Web Crawlers: Googlebot

Key Features:

Set a unique profile for each site or keep it blank to retain your natural browser properties.

Deep Client Spoofing: Seamlessly updates both network request headers (User-Agent) and front-end execution characteristics (navigator.userAgent and navigator.platform).

Privacy-First Design: Fully open-source, uses minimal WebExtension permissions, operates entirely locally on your machine, and never tracks your browsing patterns.

Developer Note on Anti-Fingerprinting: If you are using this to avoid installing a sites app on Android devices, we highly recommend opening advanced settings and manually toggling privacy.resistFingerprinting Sites such as reddit.com will detect you are using mobile without this enabled. The extension includes a single-click convenience shortcut to copy the configuration URL to your clipboard.

User Growth & Download Statistics

Add-on

By:

Chris Judevine

Daily users:

2 -1

Version:

1.0.1 Last updated: 2026-07-15

Version code:

6357624

Creation date:

2026-07-09

Risk:

Permissions:

Host permissions:

http://*/*
https://*/*

Content scripts matches:

Size:

15.86KB

Email:

ch*****@gmail.com

URLs:

Website

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-26

Compare stats and ranking:

Ranking

# 62,764 ▼ 9,548

Other rankings

#174 in spoon keyword 1 ▼ 2

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:

Chris Judevine

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/user-agent-auto-spoofer/

Email:

ch*****@gmail.com

Website:

https://chris-judevine.blogspot.com/2026/07/firefox-user-agent-automatic-switcher.html

Permission Change History

2026-07-16: Version 1.0.0 → 1.0.1

Add Permissions: privacy

Is User-Agent Auto Spoofer 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 Auto Spoofer requires some sensitive permissions that could impact your browser and data security. 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 Auto Spoofer is recently added, and hasn't been around long enough for us to gather enough data to accurately assess its risk level.

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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