Cost / License
- Free
- Open Source (GPL-3.0)
Application type
Platforms
- Microsoft Edge
- Google Chrome
- Opera
- Brave
- Chromium
- Mozilla Firefox




User JavaScript and CSS is described as 'Userscript's and userstyle's — simple extension to inject own JavaScript or CSS rules to any page' and is a user styles manager in the development category. There are more than 10 alternatives to User JavaScript and CSS for a variety of platforms, including Mac, Google Chrome, iPhone, iPad and Mozilla Firefox apps. The best User JavaScript and CSS alternative is Stylus, which is both free and Open Source. Other great apps like User JavaScript and CSS are Noir, Stylebot, xStyle and Amino: Live CSS Editor.




Noir is a Safari extension for iOS that automatically adds a dark mode to every website you visit.




Change the appearance of websites instantly by applying a easy to use interface for changing the CSS. Preview and install styles created by users for your favorite websites.





Make visual changes to any website with CSS and see changes in real time. Sync, edit, and export your custom style sheets.



Dynamically load stylesheets in Firefox from plaintext files in your profile.
superUserContent is a simple Firefox plugin that creates a new directory in your profile's chrome directory called userContent.css.d. You can use this directory as a runtime path for css styleshee.









Makeover lets you change the appearance and behavior of web pages with CSS and JavaScript. To use it, you go to a web page you want to customize, tap the Makeover icon, and paste the code into the text field.








This app helps to activate night theme on devices that don't provide this option in the system settings.




This Safari extension offers dark mode browsing in Safari. Dark Night adds a beautiful theme to every page you visit.



