Description from the website

"Stylus" is a fork of the popular Stylish extension which can be used to restyle the web. Not "ish", but "us", as in "us" the actual users... The objective in creating Stylus was to remove any and all analytics, and return to a more user-friendly UI.

Stylus is a website theming extension that allows anyone to create or install custom themes for websites using CSS. It works as an extension in your web browser and allows for seamless integration of themes for websites.

Features

• Easy to use UI for quick and easy theme selection, creation, and installation
• Native support for UserStyles for seamless installation of themes
• Free of tracking and analytical software, unlike its predecessor
• Open-Sourced, allowing for anyone to contribute to the project and validate its privacy
• Compatible with Chrome-based browsers (including Brave), Firefox, and Opera