Witchcraft: JS/CSS injector

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

Users1K

Rating4.6

Reviews11

Manifest versionV3

7-day growth0

7-day growth rate0%

Preview

Witchcraft: JS/CSS injector Media preview

2 assets

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4.64

Latest

4.64

30-day rating change

0.00

2026年5月29日2026年6月4日

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Technical snapshot

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Version3.2.0

ManifestV3

Size72.32KiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

Product summary

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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.

Reviews