Firefox is about as much of a nerd platform as Linux. Most people I know buy laptops just for internet explorer with occasional use of Microsoft office. that's all they know. This is also the same group of people who say the best phone is the iPhone, and the only reason they give is because it just is.
And I wouldn't call Linux a nerd platform. If you ever watch the irc servers that the hacker group anonymous hang out, they never discuss hacking windows servers. Only Linux and some bsd. But They are effective at hacking windows PC's..... kinda scary to watch.