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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

Cascadea

Remix the web. exclusively for macOS and Safari.

Dark Background and Light Text

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

It is a universal night mode for the entire Internet.

Dark Reader

Reduce eye strain in your browser with this extension that provides a dark theme for browsing.

FreeStylerWs

Styles and skins for all popular sites in the web

Greasemonkey

Customize the way a web page displays or behaves, by using small bits of JavaScript.
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Man in the Middle

Modify requests, inject JavaScript and CSS into pages.

Midnight Lizard

Accessible color schemes for all websites

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.

Tampermonkey

Greasemonkey compatible script manager.

VK Photo Zoom

Enlarge photos, images and thumbnails in VK.
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Violentmonkey

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

superUserContent

Dynamically load stylesheets in Firefox from plaintext files in your profile.
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xStyle

A user styles manager for the Web