Stylus allows you to install themes and skins for many popular sites easily.

Redesign your favorite websites with Stylus, an actively developed and community-driven user styles manager. Easily install custom themes from popular online repositories, or create, edit, and manage your personalized CSS stylesheets.

Features
Versatility of theme installation options. Stylus supports installs from popular online repositories. Additionally, styles can also be installed from .user.CSS or .user. Styl URLs (see Usercss format documentation in our GitHub wiki).
A backup feature for your entire database of installed styles compatible with other user styles managers.
An intuitive and configurable automatic update function for installed styles.
A highly customizable UI, including theming, optional layouts, icon and badge color choices, and many other tweaks.
Two different optional code validators with user-configurable rules.

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