Stylem

By: Lootyhoof

About this add-on

Got a website you want to change the look of, or a part of your browser you'd like to tweak? Style 'em with Stylem, the UserCSS-compatible userstyle manager for Pale Moon, Basilisk, Epyrus, and other UXP-based applications!

Stylem, forked from the last fully open source release of Stylish for Firefox (2.0.7), lets you create custom CSS styles for any website or any part of your browser. You can install styles from userstyles.world and other repositories, or paste URLs directly into the Add-ons Manager via the "Install from URLs" button.

Stylem supports the UserCSS metadata format (@name, @description, @namespace, @var, @preprocessor, etc.), giving you rich variable customization and update URL tracking for styles that provide them. A built-in editor with live preview, CodeMirror syntax highlighting, and variable controls makes creating and editing styles straightforward.

Usage of Stylem remains similar to Stylish. For documentation, please consult the Stylem docs. However, extensions designed to work with Stylish may need re-adapting for Stylem.

If you are a previous user of Stylish, please disable or remove Stylish before using Stylem, as due to the way both integrate with the Add-ons Manager they are not compatible with each other and will result in issues. Any styles saved in Stylish will be transferred, as both use the same storage format. Settings from Stylish itself will not be transferred; Stylem uses its own settings (extensions.stylem.* in about:config). As of Stylem 3.0.0 it is also possible to import/export in a format compatible with Stylus, so you can bring your styles with you.

Preview

Install Now