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Full user review
"Warning -- It Won't Go Away"
What's wrong outweighs what's right by 6,000 to 1.
StumbleUpon refuses to leave my computer. I have killed the program according to instructions, but it still gives me prompts sometimes when I try to call up Firefox and I can't get on the Web until I answer the stumbleupon prompt.
Any program that slows you down and won't go away when you want it to is malware. Stay away from it.