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Protect yourself against a pure CSS data stealing attack called Exfil
CSS Exfil Protection is a browser extension for Mozilla Firefox and Google Chrome that protects data against CSS Exfil attacks.
An attack, named CSS Exfil (from exfiltrate), uses CSS to steal data. Mike Gualtieri, the researcher who discovered the vulnerability, published several proof of concept attacks designed to steal usernames, passwords, and other data on web pages it is used on.