Enhancing Blockchain Security with the Safu Browser Extension

Although blockchain has revolutionary potential across diverse areas, it faces significant security vulnerabilities that threaten user assets and information. The primary security issues included smart contract exploits and social engineering attacks. Smart contracts exploit target code vulnerabilities and logic flaws, and social engineering involves fake websites and malicious browser extensions designed to steal user credentials and private keys. This study will analyse two major real-world attacks, the 2025 ByBit hack and the 2021 Poly Network attack. The ByBit attack led to $1,40 billion in losses through social engineering, and the Poly Network resulted in $611 million being stolen by exploiting cross-chain protocol vulnerabilities. Both cases highlight how human errors and technical flaws can lead to severe security breaches. To address these challenges, this study proposes a web browser security solution that has multi-layered protection mechanisms, the Safu Extension. The system integrates phishing website detection, domain whitelisting and blacklisting, and community-based threat reporting. Other than that, it also integrated AI-powered malicious code detection in smart contracts and transaction simulation. A comparative analysis with existing solutions will demonstrate that Safu Extension offers better overall protection by combining automated detection, community intelligence, and a user-friendly interface.