BlueMarlin is a free browser extension designed to enhance security by blocking malicious websites, preventing phishing attacks, malware, and harmful applications. It incorporates the Google Safe Browsing API to verify redirections, ensuring a safer browsing experience. The extension aims to further bolster security by connecting to additional queries to identify malicious websites, performing SSL certificate validation, analyzing page content and scripts, and providing educational components for users.

BlueMarlin also focuses on improving its user interface and behavior, with plans to implement a feature that checks historical URLs using regex to detect attempts to simulate legitimate websites, such as replacing 'l' with 'I' in 'LinkedIn.' Additionally, a user feedback form is in the works to gather insights for further enhancements.