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Is xStyle safe?

This security report analyses whether xStyle is safe to install on your browser. We check xStyle for malicious behaviour, data exfiltration, suspicious permissions, and known vulnerabilities so you can decide if xStyle is safe for your personal or enterprise fleet.

Low risk

xStyle is a CSS user-styles manager (open-source, by FirefoxBar) that applies custom CSS to web pages. It includes opt-in cloud sync via OAuth2 (Dropbox, Google Drive, OneDrive), opt-in CSP header modification to allow inline styles, and optional style auto-update from external URLs. All behaviors align with the extension's stated purpose.

0Risk

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

Updated 10 April 2026hncgkmhphmncjohllpoleelnibpmccpj

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