Safari homepage suddenly changed to localhost in Mac Malware Removal Help & Support Posted June 17, 2019 Hi there, I'm new here and looking for some help (I'm not sure if this is the right place, so if it's not please point me where I need to go). The homepage on my Safari has suddenly changed to http://localhost/?"\ and I'm unable to change it back to Google. I'm running macOS High Sierra 10.13.6 on a 2016 MacBook Pro. I've removed WeKnow adware (infected via Chrome) from the same computer months ago but have no other symptoms other than the homepage issue now. I 've had Malwarebytes installed/updated for years now and it's returning zero threats. I only updated my OS three days ago so I'm not sure if it's just an update glitch, but the issue only began appearing today.