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I don't think Firefox is any more stable then IE but since my Certified Ethical Hacker class I have been using firefox with the NoScript plugin. There are a ton of potential attacks that can be done through the browser. Even on this forum.
It teaches you how to use hacking utilities so you can PIN test networks. The ethics part comes in when you only do it to systems your allowed to. Fun class. I've always wanted to take it since I took the MCSE and Security+ courses.