xStyle is a free Firefox extension that enhances web development by allowing users to customize styles on websites easily. Based on the Stylish-for-Chromesource code, it offers a more refined user interface and is fully compatible with the latest Firefox nightly builds. Users can import styles from Stylish, making it convenient for those familiar with the previous tool. Notably, xStyle prioritizes user privacy, ensuring that no data is collected regardless of how the extension is utilized.

This extension is categorized under Development & IT, specifically focusing on web development. Users can access the source code and find additional resources like a wiki for help, bug reporting, and translation assistance. For those looking to stay ahead of the curve, a self-distribution version is also available for download, allowing early access to the latest features.