It was clear to me that his browser had been hijacked.We got rid of the browser hijack pretty quickly - I suggest using Cella's excellent how-to if you ever run into a browser hijack yourself - but the slowdowns were more curious.
My father-in-law's MacBook Pro had been running into curious slowdowns for a two-year-old laptop and he kept on seeing weird sites taking over his Safari and Firefox search bars. Serenity Caldwell writing for iMore in 2017:
The problem: Mac malware in the Library folder
The problem: Mac malware in the Library folder. That’s why educating Mac users about the threats to this ecosystem is very important. “As Macs become more common,” he tells me, “so the cybercrime focus increases-it’s a good source of income, and protections are far less mature than Windows. Don’t open attachments from unknown sources and be very wary of links in emails or messaging apps on your Mac. Given that Apple has acknowledged that “today we have a level of malware on the Mac that we don't find acceptable," and that it has used this problem to justify the iPhone walled garden that is now under antitrust scrutiny, there’s little alternative.īalmas also warns users to adhere to the usual anti-phishing common sense behaviours. The time has come when you can’t trust Apple’s supposedly locked down ecosystem to do the job for you. Realistically, you would be well advised running a reputable antivirus software package on your Mac, just as you would need to if running a PC. Delete any that are found, the firm says, giving the example of “” as the kind of filename you should look for. 
Check Point urges users to check the usually hidden from view LaunchAgents directory in their library, where they should check for “suspicious” filenames.
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