I always found that it was best not to lie to users for their own good, at least if you want them to continue considering you a trusted source of computing info

I always found that it was best not to lie to users for their own good, at least if you want them to continue considering you a trusted source of computing information. You don't have to explain what firefox is, or what IE is, just that "this isn't IE but it does the same thing and will keep you safe". Maybe they'll have follow up questions, and you can answer those, but lying is just a good way for them to go back to IE and not tell you because they don't to be treated condescendingly.