User-Agent Changer

Name: User-Agent Changer
Author: Shawon2901

Change your browser's User-Agent at the network level. Bypass server-side browser detection. With the latest and greatest Ui in the market

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Features & Capabilities

🚀 OVERVIEW A high-performance Firefox extension that replaces your browser's User-Agent at the network level. By utilizing webRequest, it ensures web servers identify your browser and OS exactly as you choose, bypassing both client-side and server-side detection.

⚙️ HOW IT WORKS Unlike scripts that only modify navigator.userAgent in JavaScript, this extension intercepts every outgoing HTTP request via webRequest.onBeforeSendHeaders. It rewrites headers before they leave your browser, providing a true network-level spoof that affects server-side logic and deep-packet inspection.

🆕 NEW IN VERSION 6.0: CHROMIUM HEADER INJECTION To bypass modern anti-bot and fingerprinting systems (like Client Hints), the extension now dynamically injects five SEC-CH-UA headers when a Chromium-based UA is selected:

• Sec-Ch-Ua: Correct branding strings (e.g., "Google Chrome", "Chromium"). • Sec-Ch-Ua-Mobile: Accurate ?1 (mobile) or ?0 (desktop) flags. • Sec-Ch-Ua-Platform: Matches the spoofed OS (Android, Windows, iOS, etc.). • Sec-Ch-Ua-Platform-Version: Corresponding version strings. • Sec-Ch-Ua-Full-Version-List: Precise build versioning.

🔹 Smart Logic: • Brand Matching: Switches between Edge, Samsung, Opera, or Chrome brands based on active UA. • Privacy Stripping: Firefox/Safari UAs have Client Hint headers stripped automatically. • Accept Header Fix: Swaps Firefox’s format for Chrome’s on main_frame requests.

🌟 CORE FEATURES • 50+ Preset User Agents across 9 categories. • Dual Filtering Modes: Exclusion Mode and Inclusion Mode. • "Always Real" Protection: Prevents breakage on cloudflare.com or 1.1.1.1. • Intent Handling: Rewrites Android intent:// redirects into standard https:// URLs. • Visual Feedback: Toolbar icon shows an "OFF" badge when inactive.

🛠️ USE CASES • Bypass server-side blocks targeting specific browsers. • Test responsive rendering without device-switching. • Reduce your unique browser fingerprinting surface. • Trigger mobile-optimized responses from desktop Firefox.

User Growth & Download Statistics

Add-on

By:

Shawon2901

Daily users:

Version:

6.0 Last updated: 2026-05-03

Version code:

6245603

Creation date:

2026-04-28

Risk:

Permissions:

Size:

29.32KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-07-14

Compare stats and ranking:

Ranking

# 24,139 ▼ 31

Other rankings

#28 in agent keyword 62 ▼ 1#64 in exchange keyword 11 ▼ 1#68 in agenda keyword 17 ▼ 2#203 in marketing keyword 10 ▼ 4

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:

Shawon2901

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/user-agent-changer2901/

Is User-Agent Changer 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 Changer 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 Changer 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 has low user count. Unpopular extensions may not be stable or safe.
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