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How do I remove advertisements from my browser?

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When I click the + button to open a new tab, an ad for Booking.com shows up. I clicked the x button, but a different ad came back. I think my browser is infected with some sort of "adware". Can you help me get rid of it?

When I click the + button to open a new tab, an ad for Booking.com shows up. I clicked the x button, but a different ad came back. I think my browser is infected with some sort of "adware". Can you help me get rid of it?

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See the booking . com Malware Manual Removal Guide here: http://blog.doohelp.com/how-to-get-rid-ofremove-www-booking-com-pop-up-virus-removal/