Download User-Agent Header Manager

Name: User-Agent Header Manager
Author: Viacheslav Zhabonos

By: Viacheslav Zhabonos Add-on

Download User-Agent Header Manager (current and past versions) for Firefox

Latest Version: 1.0.1 Updated: 5 months ago

Ready to install?

User-Agent Header Manager is available to install from Firefox Add-ons Store and for download from this page.

View source code

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Available versions

You can find the current and older versions of User-Agent Header Manager here. You can download the archived versions or inspect their source codes.

As a free user, you can download up to 3 latest versions.

Upgrade to download older versions

Version	Download	Size	Download count	Timestamp
1.0.1	XPI · ZIP · Source code	36.61KB	0	2026-02-23
1.0.0	XPI · ZIP · Source code	40.16KB	0	2026-02-20

2026-02-23 · 0 downloads

XPI ZIP Source code

2026-02-20 · 0 downloads

XPI ZIP Source code

Install XPI file

An XPI file, short for "XPInstall," is a compressed file format used primarily by Mozilla applications, like Firefox and Thunderbird, to distribute and install add-ons or extensions. These files are similar in function to CRX files for Chrome but cater to the Mozilla ecosystem.

Simply drag-and-drop the XPI into Firefox to install the add-on.

Install ZIP file

Download the User-Agent Header Manager ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the User-Agent Header Manager ZIP file from step 1. User-Agent Header Manager is now installed on your browser.