Correcting someone's spelling after saying "You cannot argument like this." is not an advisable practice. Be correct in grammar AND spelling before correcting others; that's the lesson here kiddies.
Just to add to the talk, generally the safer option right now is the one to go with. Saying that IE's only more exploited for the time being and FireFox WILL be vulnerable to attack in the future doesn't mean anything except that it'll be time to switch when FireFox becomes vulnerable to attacks. For now, however, FireFox is safer.