User Styles Managers

Redesign the web with Stylus, a user styles manager.

Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.

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.

A user style manager for Pale Moon, Basilisk, Interlink, SeaMonkey, and other Mozilla-based software. Install styles from userstyles.org to change how web pages and the application look.

A Chinese Developed Theme Manager. based on the source code of Stylish-for-Chrome 1.7.0.

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.

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

Introducing Cascadea, the first custom style manager designed as a Safari App Extension and native macOS app. Cascadea makes it easy to install custom styles that change the look and feel of any website you want.