We describe the detrimental effects of browser cache/history sniffing in the context of phishing attacks, and detail an approach that neutralizes the threat by means of URL personalization; we report on an implementation performing such personalization on the fly, and analyze the costs of and security properties of our proposed solution. Categories and Subject Descriptors H.4.3 [Information Systems]: Communications Applications--Information browsers General Terms Security, Human Factors Keywords Browser cache, cascading style sheets, personalization, phishing, sniffing.