Answer: POPUPAD

AnswerCrossword Clue
POPUPADSurfing hazard?
POPUPADSurfing intrusion
POPUPADSurfing annoyance
POPUPADBrowsing annoyance
POPUPADWeb surfer's annoyance
POPUPADCyber-nuisance
POPUPADComputer plug?
POPUPADOnline annoyance
POPUPADWindow you might want to close quickly