Related Clues:
- Pop-up producer
- Programs with popups, perhaps
- Pop-up source
- Pop-up generators
- Hard-drive infestation
- Invasive computer programs
- Program that generates online pop-ups
- Producer of pop-ups
- Program with popups, perhaps
- Invasive software, perhaps
- Program producing pop-ups
- Pop-up-producing program
- Online pop-up source
- Online menace with hydrogen could make warhead?
- Programming behind computer pop-ups