No one should be able to access your device or browser without your consent. Firefox Nightly and DuckDuckGo are designed with privacy in mind, but it’s important to keep your system updated and avoid suspicious downloads or extensions. If you’re concerned about spyware or unauthorized access, running a reputable antivirus and checking your device for unusual activity is a good start. Also, make sure you’re using secure connections (HTTPS) and consider using a VPN for extra privacy.