Download DevHeaders - HTTP Header Editor & Modifier

Name: DevHeaders - HTTP Header Editor & Modifier
Author: DevHeaders

By: DevHeaders Add-on

Download DevHeaders - HTTP Header Editor & Modifier (current and past versions) for Firefox

Latest Version: 1.0.1 Updated: 12 days ago

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DevHeaders - HTTP Header Editor & Modifier is available to install from Firefox Add-ons Store and for download from this page.

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Available versions

You can find the current and older versions of DevHeaders - HTTP Header Editor & Modifier 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	38.48KB	0	2026-07-15

2026-07-15 · 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 DevHeaders - HTTP Header Editor & Modifier ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the DevHeaders - HTTP Header Editor & Modifier ZIP file from step 1. DevHeaders - HTTP Header Editor & Modifier is now installed on your browser.