Witchcraft: JS/CSS injector

Witchcraft loads custom Javascript and CSS directly from a folder in your file system. Think GreaseMonkey for developers.

As of June 2026, Witchcraft: JS/CSS injector has 1,000 users and a 4.64/5 rating from 11 reviews in the Developer Tools category.

Usersno change0%
1.0K
1,000
Ratingno change0%
4.64
11 reviews
Reviewsno change0%
11
Version
3.2.0
Manifest V3

History

2 snapshots

Tracking since Apr 20, 2026.

1.0K1.0K988.4Apr 20, 2026Jun 10, 2026
View as table
DateUsersRatingReviewsVersion
Apr 20, 20261.0K4.64113.2.0
May 5, 20261.0K4.64113.2.0
Now1.0K4.64113.2.0

Permissions & access

Permissions
webNavigationstorageactiveTabscriptinguserScripts
Host access
http://*/*, https://*/*

Screenshots

Witchcraft: JS/CSS injector screenshot 1

About

Think Greasemonkey for developers.

Witchcraft is a Google Chrome extension for loading custom Javascript and CSS directly from a folder in your file system, injecting them into pages that match their files names.

It works by matching every page domain against script file names available in the scripts folder. For instance, if one navigates to `https://www.google.com`, Witchcraft will try to load and run `google.com.js` and `google.com.css`.

Witchcraft also tries all domain levels. For instance, if one accesses `https://gist.github.com`, it will try to load, in this order: `com.js`, `github.com.js` and `gist.github.com.js`... and the same for CSS. All domain levels for which a script is found will be loaded, not just the first one.

Whenever you edit or create new scripts, there's no need to reload anything other than the page where the scripts are supposed to run. This is what makes Witchcraft special and different than other popular scripting tools, like Greasemonkey or Tampermonkey.

Since Witchcraft runs as a Chrome extension, it is also cross-platform. It has been tested on Windows, MacOS and Linux.

Features:

* scripts are automatically updated after you edit them - no need to reload anything;
* works on Windows, Mac and Linux;
* handles both JS and CSS;
* @include directive to load other JS/CSS files from inside your domain scripts.
* custom server addresses (even remote ones)

Please check the website if you want to learn more.

Technical

Version
3.2.0
Manifest
V3
Size
72.32KiB
Min Chrome
88
Languages
1
Featured
No

Metadata

ID
hokcepcfcicnhalinladgknhaljndhpc
Developer ID
u678b3bcea373d2bcd9aa492672031066
Developer Email
[email protected]
Created
Aug 5, 2017
Last Updated (Store)
Sep 15, 2025
Last Scraped
Jun 10, 2026
Website
luciopaiva.com
Privacy Policy

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Data sourced from the Chrome Web Store · last verified Jun 10, 2026.