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Stylus - User Styles Manager

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

17 Alternatives To Stylus - User Styles Manager

Dark Background and Light Text

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

Nuclino Dark Mode

Experience a darker side of collaboration 😎

Owl

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

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