This image will help you block popups from annoying adware. 

@adejonghm I had the same issue caused by adware affecting my browser. I did these things to remove it.
On linux-mint I used timeshift to go GOBACK to a safe restore point. I enabled "block-adware" on Opera Advance->settings->

• "Block ads and surf the web faster" -enabled

• Block trackers "manage exceptions-w gmail" -enabled.

• Install a third partner extension "Badger" -enabled.