The easy and quick way is to download a quality Mac antivirus program — it does the hard work for you by scanning your entire device. It not only finds out where Search Marquis is hidden, but it also detects any other adware, spyware, trackers, trojans, or viruses that you’ve accidentally installed onto your Mac.
This is very common with Search Marquis, as the virus bombards your Mac with malware-packed links and pop-ups. As soon as you click, you’ve just infected your Mac with even more malware.
If you’ve already removed all malware strains from your Mac with an antivirus, you still need to reset your browser and remove all cached files. I’ve outlined easy-to-follow instructions for Safari, Chrome, and Firefox.