Download Web Developer Tools

Name: Web Developer Tools
Author: SessionManager.net

By: SessionManager.net Add-on

Download Web Developer Tools (current and past versions) for Firefox

Latest Version: 1.3.2 Updated: 3 days ago

Ready to install?

Web Developer Tools 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 Web Developer Tools 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
1.3.2	XPI · ZIP · Source code	1.20MB	0	2026-09-22

2026-09-22 · 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 Web Developer Tools ZIP file.
In Firefox browser, go to about:addons to open Add-ons Manager
Click on ⚙, Install Add-on From File
Select the Web Developer Tools ZIP file from step 1. Web Developer Tools is now installed on your browser.