User JavaScript and CSS chrome extension

Version: 1.2.8
User JavaScript and CSS
User JavaScript and CSS on any website
4.83 Based on 398 user rates

What is User JavaScript and CSS?

User JavaScript and CSS is a css extension for chrome. also, it is javascript extension. it's a free extension , it has 100,000+ active users since released its first version, it earns an average rating of 4.83 from 398 rated user, last update is 777 days ago.

What’s new in version 1.2.8?

                Userscript's and userstyle's — simple extension to inject own JavaScript or CSS rules to any page.

- Instant execution
- Custom libs include
- URL masking allows use one script or CSS on many pages

Change log:

Version 1.2.8
- Added function for naming rules
- Updated translations

Version 1.2.7
- Updated all extension libraries to current versions

Version 1.2.6
- Fixed error in console "Unchecked runtime.lastError: The message port closed before a response was received"
- Improved domain getter from URL
- Updated Ace Editor and jQuery to latest

Version 1.2.5
- Resolved bug with '@import' and "Auto-important css" feature
- "Auto-important css" feature now disabled by default
- Added feature to exclude URL's by '!' symbol at start
- Updated jQuery and Ace editor to last versions
- Other small fixes

Version 1.2.4
- Added manual cloud sync in testing mode
- Improved "auto-important css" feature
- Other small fixes

Version 1.2.1
- Fixed algorithm of "high priority CSS"

Version 1.2.0
- Added toggle button in site list
- Added documentation tab
- Added 'Vintage mode' option to Ace Editor
- Updated jQuery, Ace Editor to last versions
- Other small fixies

Version 1.1.5
- Returned old method injection and added option to toggle this. Alternative method has feature to avoid CORS issues, but has only DOM access to site (no JS context). Old and now primary method is injecting by <script> tag on site bottom.
- Added scroll past end in editor

Version 1.1.2
- Minor bug fixes

Version 1.1.0
- Added new injection system that increased perfomance
- Added feature: few URLs in one rule (separate by commas)
- Added word wrap setting
- Added CSS auto !important option
- Minor changes

Version 1.0.2
- Hot fixes

Version 1.0.0
- Full redesign of extension
- Added more settings
- Added toggleable counter on extension icon

Version 0.98
- Fix bug that prevent create new rules
- Minor changes

Version 0.96
- Full redesign of extension interface
- 80% code of extension core has been rewritten
- New feature: change URL field and mask with "*" symbol (eg *
- Editor window opens in new tab in split layout
- Disabled autosave feature
- Configurable editor in settings
- New icon

Version 0.94
- Hotfix editor opening bug

Version 0.93
- Fixed a bug where JavaScript is not always inserted in a page
- Outdated processes are disabled

Version 0.92
- Code autosave work on all pages

Version 0.91
- Fix "" zone parse
- Other small fixes

Version 0.90
- Improve core
- Add feature to load own libraries

Beta test. If you find any problem or have a question contact me on email.            

How to install User JavaScript and CSS?

You could download the latest version crx file or older version files and install it.

Preview of User JavaScript and CSS

Technical Features:

  • Latest Version: 1.2.8
  • Requirements: Windows Chrome, Mac Chrome
  • License: Free
  • Latest update: Saturday, February 6th, 2021
  • Author: tenRabbits

User JavaScript and CSS Available languages:

English, русский.


Reviews of user javascript and css:

Josh Wilson March 10th, 2023
Josh Wilson

I absolutely love this extension! but please add a dark mode for the whole extension, settings page and all, not just the editor window, ive tried to fix it using the extension itself, but it seems css cant be injected into extension pages, like the chrome store, annoyingly

William Angel March 6th, 2023
William Angel

The best extension

J. Martin March 6th, 2023
J. Martin

Great extension but fails to work in page iframes :( yes the iframes are for the same domain it just doesnt attach the script or CSS to them

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