superUserContent

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

15 Alternatives To superUserContent

Cards by JotForm

The friendly way to ask

Cascadea

Remix the web. exclusively for macOS and Safari.

Colorific

Colorific Hair Color Salons give you amazing color at an affordable price.

Dark Background and Light Text

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

Dark Mode

A global dark theme for the web

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
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Man in the Middle

Modify requests, inject JavaScript and CSS into pages.

Midnight Lizard

Accessible color schemes for all websites

Shifty

More control over macOS Night Shift
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Stylish

Build beautiful React styled components visually 💅🌠
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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.

Tampermonkey

Greasemonkey compatible script manager.
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Violentmonkey

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

A user styles manager for the Web