Because you didn't install it correctly. I have never had this problem.
Really, most writers endeavor to conceal rather than advertise their ineptitude in their field of alleged expertise.
i have both foxfire and ie.
i prefer foxfire because there are less problems, log-ins and passwords work better, etc.
one problem that occurs with both, more often with ie, is that when you click on something, a grew balloon appears and says it isn't available. but click again, and usually it connects.
it's not spy or ad ware. i have spy bot, and ad-ware and use them routinely and often.