Witchcraft: JS/CSS injector

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

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Witchcraft is a powerful Chrome extension designed for developers needing seamless injection of custom JavaScript and CSS into web pages. Unlike traditional tools such as Greasemonkey or Tampermonkey, Witchcraft automatically loads scripts and stylesheets directly from a designated local folder based on the current page's domain.

It dynamically matches domain levels to corresponding script files (e.g., github.com.js, gist.github.com.css) and updates them instantly when files are edited—requiring no page or extension reload. Compatible across Windows, MacOS, and Linux, Witchcraft supports both local and remote server script sources, as well as @include directives for modular script loading. This extension streamlines front-end customization and testing workflows by providing a reliable, cross-platform developer tool for live web page enhancements.

Extension Developer Tools Programming Productivity

By:: https://luciopaiva.com
Users:: 1,000
Rating:: 4.60

(10)
Version:: 2.6.1 Last updated: 2020-03-10
Creation date:: 2020-03-10
Risk:: Low risk impact Low risk likelihood
Size:: 27.24KB
Email:: wi*****@gmail.com
URLs:: Website
Full description:: See detailed description
Source:: Chrome Web Store
Data ingested on:: 2025-07-15

Ranking

# 24,826 ▲ 80

Other rankings

#3371 in Developer Tools ▲ 8

User reviews

Pros

Clearly better than Tampermonkey for many users
Great for customizing web pages
Helpful for visually-impaired users by allowing fine-grained control over webpage display
Easy to use with access to jQuery libraries
Received positive feedback for adding requested features

Cons

Difficult setup for some users
Lack of developer response to inquiries
Not working on Chrome OS
No Firefox port

Recent reviews

I had trouble setting it up. I followed the instructions as best I could and then reached out to the developer with a descriptive inquiry, inclusive of images. No response. Nonetheless, I can't knock the app too much because of my technical limitations. If I could get it to work it would be significantly better than tampermonkey.

Ma*****, 2022-05-23

I can't believe I was using Tampermonkey for so long as this is clearly better by a longshot.

Ja*****, 2021-08-01

Love this one!

E *****, 2020-03-01

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Extension safety

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Witchcraft: JS/CSS injector requires very minimum permissions.

Risk impact analysis details

High Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.

Risk likelihood

Risk likelihood measures the probability that a Chrome extension may turn malicious. This is determined by the publisher and the Chrome extension reputation on Chrome Web Store, the amount of time the Chrome extension has been around, and other signals about the Chrome extension. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Chrome extension.

Witchcraft: JS/CSS injector has earned a fairly good reputation and likely can be trusted.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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