Security extensions are additional features or tools that enhance the protection of software applications, particularly web browsers. They help safeguard users from various online threats, such as malware, phishing attacks, and data breaches. By integrating these extensions, users can improve their overall online security and privacy. These extensions often include functionalities like ad-blocking, password management, and secure browsing modes. Popular examples of security extensions are HTTPS Everywhere, which ensures secure connections, and uBlock Origin, which blocks unwanted ads and trackers. By using these tools, individuals can create a safer online experience.