All browsers are provided free of charge and will run equally well on an average piece of hardware. Why do you think browser use is related to income?

First we know IQ is correlated with income.

We might guess Mac (hence Safari) users are correlated with income.

We might guess Opera users are correlated with income for several reasons.

We might guess Chrome users are correlated with income.

We might guess Firefox users are correlated with income.

We could guess the same of Lynx or any other niche browser more likely to be popular with well educated, higher income bracket people.

We might guess those things, I suppose. I was wondering why specifically.

Are you saying you think it is mainly related to education, and education is correlated to high income, this that's the link and not something else?