Download Web Developer Sidekick

Name: Web Developer Sidekick
Author: Jamal Lahyani

By: Jamal Lahyani

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

Latest Version: 0.0.32 Updated: 5 months ago

Ready to install?

Web Developer Sidekick is available to install from Firefox Add-ons Store and for download from this page.

View source code

Daily users

3.7

3 ratings

Total downloads

Available versions

You can find the current and older versions of Web Developer Sidekick 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	Timestamp
0.0.32	XPI · ZIP · Source code	92.38KB	2026-02-09
0.0.29	XPI · ZIP · Source code	92.35KB	2026-02-07
0.0.28	XPI · ZIP · Source code	92.18KB	2026-02-06
0.0.27resigned1	Paid users only	92.11KB	2024-04-25
0.0.26	Paid users only	89.49KB	2018-04-18

2026-02-09 · 0 downloads

XPI ZIP Source code

2026-02-07 · 0 downloads

XPI ZIP Source code

2026-02-06 · 0 downloads

XPI ZIP Source code

2024-04-25 · 0 downloads

Paid users only

2018-04-18 · 0 downloads

Paid users only

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 Sidekick 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 Sidekick ZIP file from step 1. Web Developer Sidekick is now installed on your browser.