unwanted website pops up
When I open a new tab and search anything, a website pops up:-
http://app3.letmacworkfaster .life/landings/230/?affid=mzb_316.37065871.151066062 1.32.mzb&utm_source=&utm_medium=&utm_cam…
Please help anyone!!!!!
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MacBook Air, iOS 11.1