What function do pop-up blockers typically perform in web browsers?

Pop-up blockers are designed primarily to block JavaScript-generated pop-ups from appearing in a web browser. These pop-ups often interrupt the user's browsing experience, sometimes serving advertisements or prompting unwanted actions. By preventing these pop-ups, the blockers enhance user experience and security by reducing distractions and potential exposure to malicious content.

The other functions mentioned in the choices do not accurately describe the core purpose of pop-up blockers. While content filtering and monitoring for data loss are important functions in cybersecurity, they are handled by different tools and features such as content filters and data loss prevention software. Enhancing website functionality isn't a role associated with pop-up blockers; rather, their primary concern is with controlling the display of intrusive pop-ups. Thus, the focus on blocking JavaScript-generated pop-ups highlights the specific role that these blockers play in managing how content is presented to users in their web browsers.