Somehow I have managed to get Firefox infected with TROVI malware. Following your guide to removing this I tried Malwarebytes... it found nothing. Then I tried AdwCleaner and it found multiple PUPs and succeeded in removing all but one item "search-shield.com." I tried searching for this item but was not successful. What exactly is this and how can I remove it? 2 AdwCleaner scans found it but neither time could it remove it.