What does the presence of a malicious add-on usually indicate?

The presence of a malicious add-on typically indicates that it may harm the system's security or privacy. Malicious add-ons are often designed to perform unauthorized actions such as collecting sensitive user information, injecting ads, redirecting searches, or enabling other harmful activities. These add-ons can compromise the integrity of the system, exposing it to threats like data breaches, identity theft, and malware infections. Recognizing such risks is crucial for maintaining a secure and private browsing experience.

In contrast to the correct answer, other options suggest scenarios that do not accurately reflect the nature of malicious add-ons. For instance, the idea that a malicious add-on enhances user experience or is a standard feature does not hold true, as these add-ons typically detract from the user's control and safety. Similarly, the notion that a malicious add-on ensures protection against spyware is misleading, as their very existence often serves the opposite purpose, potentially introducing additional risks rather than mitigating them.