To remove malware and ensure that nothing is controlling or monitoring your activity, start by running a full scan with a trusted antivirus or antimalware tool like Malwarebytes or Windows Defender. Make sure your operating system and Firefox are up-to-date, then clear your browser’s cache, cookies, and history. Check for any suspicious extensions in Firefox and remove them. Review your system’s active processes using Task Manager or Activity Monitor, and uninstall any unfamiliar programs. If necessary, reset Firefox to its default settings and consider using specialized tools to check for rootkits. Lastly, change important passwords and, if the issue persists, consider a clean OS installation for full security.