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superUserContent is a simple addon that creates a new directory in your profile's chrome directory called userContent.css.d. You can use this directory as a runtime path for css stylesheets. superUserContent will apply any stylesheets it finds in this directory to pages when they load.

superUserContent is for developers who want an easy way to customize the sites they frequently visit with their established toolchain. It can be used by theme designers who want to share their customizations on sites like userstyles.org so they can be applied easily by casual browser users with addons like Stylish.

This addon was made to address the current limitations of userContent.css that make it difficult to use for general web development.

Development: https://github.com/acrisci/superUserContent
Bugs: https://github.com/acrisci/superUserContent/issues

superUserContent is open source software available under the MPL 2.0 license.

Download files:


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