User JavaScript and CSS
Developer Tools
User JavaScript and CSS on any website
Users
200K
Rating
4.8
Reviews
657
7D Growth
0|0%
Stable signalUnknownHigh-risk permissions
Witchcraft: JS/CSS injector
Witchcraft loads custom Javascript and CSS directly from a folder in your file system. Think GreaseMonkey for developers.
Users1KCurrent public install base
Rating4.6Store average score
Reviews11Public review volume
Manifest versionV3Extension platform version
7-day growth0Net users gained this week
7-day growth rate0%Relative weekly velocity
Preview
2 assetsWitchcraft: JS/CSS injector Media preview
Trend
User growth trend
Review user movement across collected snapshots.
User Growth Over Time
Rating trend
7-day rating trend
View collected rating snapshots from the latest 7-day window to assess rating stability.
7-day rating change
Start
4.64
Latest
4.64
7-day rating change
0.00
2026年7月12日2026年7月18日
Growth overview
Daily, weekly, and monthly growth
Compare 1-day, 7-day, and 30-day net growth and growth rate.
1-day growthNo data
----7-day growthFlat
00%30-day growthNo data
----Technical snapshot
Version, languages, and crawl freshness
Review publication date, version, supported languages, and crawl timestamps.
Version3.2.0
ManifestV3
Size72.32KiB
Languages1English
Published
Store updated
Last crawled
English
Overview
Product summary
Review the store description, core capabilities, and common use cases.
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
Recent review snapshot
Inspect the latest comments and rating distribution.
Store average score4.6Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average4.4Average computed only from synced review bodies below
Reviews with text7Synced review bodies
Total ratings / reviews11Chrome Web Store public rating/review count
Store average score: 4.6. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
Related products
Similar and related extensions
Review related products from the Chrome Web Store detail page.
Kode Injector
Developer Tools
Inject JavaScript and CSS from local files into websites
Users
346
Rating
--
Reviews
0
7D Growth
-18|-4.95%
Scripty - Javascript Injector
Workflow & Planning
Inject your Javascript into the webpage
Users
20K
Rating
3.8
Reviews
103
7D Growth
0|0%
Super CSS Inject
Developer Tools
Keep multiple stylesheets ready to inject and change on the fly!
Users
1K
Rating
4.3
Reviews
12
7D Growth
0|0%
Inject Code
Developer Tools
Inject your own Javascript, React/JSX, CSS / LESS / SCSS/ SASS into any webpage
Users
1K
Rating
4.6
Reviews
11
7D Growth
0|0%
Restyler
Developer Tools
A devtool extension for easy restyling of any webpage
Users
459
Rating
4.5
Reviews
15
7D Growth
-27|-5.56%
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.
I can't believe I was using Tampermonkey for so long as this is clearly better by a longshot.
Love this one!
Great for customizing webpages!
Not working in Chrome OS
Many thanks Lucio! This Witchcraft Chrome Extension lets me give a visually-impaired friend fine-grained control over how each of her favourite web pages displays in her desktop browser – including the ability to: 1) Completely eliminate unwanted page sections and elements – thus maximizing her useful screen space. 2) Increase font sizes on selected elements... WITHOUT having to ctrl+/ zoom the entire page – (and all its associated chaff) – thus eliminating her need to keep scrolling side-to-side in order to view each and every line of the (non-wrapping) zoomed text. 3) Color-code hard-to-see control icons ( e.g. green=’Reply’; red=’Delete’ ). 4) Modify all the above as her hardware config changes. 5) And more...! (amongst other things, Witchcraft’s < //@include > js functionality gives access to the jQuery (and associated) libraries… helpful for easy overrides of the browser’s r-click context menu, etc. Very easy to use! Anyway, thanks again Lucio. Your work's really making a difference in my friend's life! :)
Found this the other day, awesome way of applying JS/CSS to your things! After a feature request it now has globals aswell ! yay !