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That mapfinder is like a malware. In Chrome, click on Chrome menu and select Preferences.
From the resulting window, click Extensions in left column. Cick the Delete button next to the onlinemapfinder and it will be deleted. Then click on Settings in left column, under On Startup, select Open a Specific page or set of pages, click Set Pages and set www.google.com or www.apple.com or any page you want.
Once you did that, download this Malware removal tool --> https://www.malwarebytes.com/antimalware/mac/
Open the downloaded file and then do a scan with it. It will find and remove all malware including that map finder.
Please let me know if that didn't work, so I will continue to help you
Hi there, I'm just checking. How is it going ?