Stylus - User Styles Manager

Stylus is a userstyles editor and manager based on the source code of Stylish version 1.5.2.

Dark Background and Light Text

Makes every page (or only pages that you want) to have light text on dark background.

Experience a darker side of collaboration í ½í¸

Owl is a light-weight Firefox add-on that gives webpages a dark background and dimmed colors.

Violentmonkey is a userscript manager to support running userscripts in web pages.